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[[File:Cutting a water droplet using a superhydrophobic knife on superhydrophobic surfaces.ogv|thumb|Surface tension and [[hydrophobicity]] interact in this attempt to cut a [[water droplet]].]]
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'''Surface tension''' is a contractive tendency of the surface of a [[liquid]] that allows it to resist an external force. Surface tension is an important property that markedly influences the ecosystem. Surface tension is exposed, for example, any time an object or insect (e.g. [[Gerridae|water striders]]) that is denser than water is able to float or run along the water surface. At liquid-air interfaces, surface tension results from the greater attraction of water molecules to each other (due to [[Cohesion (chemistry)|cohesion]]) than to air (due to [[adhesion]]). The net effect is an inward force at its surface that causes water to behave as if its surface were covered with a stretched elastic membrane. Because of the relatively high attraction of water molecules for each other, water has a high surface tension (72.8 millinewtons per meter at 20°C) compared to that of most other liquids. Surface tension is an important factor in the phenomenon of [[capillary action|capillarity]].


Surface tension has the [[dimensional analysis|dimension]] of [[force]] per unit [[length]], or of [[energy]] per unit [[area]]. The two are equivalent—but when referring to energy per unit of area, people use the term [[surface energy]]—which is a more general term in the sense that it applies also to [[solid]]s and not just liquids.
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In [[materials science]], surface tension is used for either [[surface stress]] or [[surface energy|surface free energy]].
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[[Image:WassermoleküleInTröpfchen.svg|thumb|Diagram of the forces on molecules of a liquid]]
 
[[File:Surface tension March 2009-3.jpg|thumb|left|Surface tension preventing a paper clip from submerging.]]
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The cohesive forces among liquid molecules are responsible for the phenomenon of surface tension. In the bulk of the liquid, each molecule is pulled equally in every direction by neighboring liquid molecules, resulting in a net force of zero. The molecules at the surface do not have other molecules on all sides of them and therefore are pulled inwards. This creates some [[internal pressure]] and forces liquid surfaces to contract to the minimal area.
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Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer. In the absence of other forces, including [[gravity]], drops of virtually all liquids would be perfectly spherical. The spherical shape minimizes the necessary "wall tension" of the surface layer according to [[Young–Laplace equation|Laplace's law]].
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Another way to view surface tension is in terms of energy. A molecule in contact with a neighbor is in a lower state of energy than if it were alone (not in contact with a neighbor). The interior molecules have as many neighbors as they can possibly have, but the boundary molecules are missing neighbors (compared to interior molecules) and therefore have a higher energy. For the liquid to minimize its energy state, the number of higher energy boundary molecules must be minimized. The minimized quantity of boundary molecules results in a minimized surface area.<ref name="white">{{Cite book|last=White|first=Harvey E.|title=Modern College Physics|publisher=van Nostrand|year=1948|isbn=0-442-29401-8}}</ref>
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As a result of surface area minimization, a surface will assume the smoothest shape it can (mathematical proof that "smooth" shapes minimize surface area relies on use of the [[Euler–Lagrange equation]]). Since any curvature in the surface shape results in greater area, a higher energy will also result. Consequently the surface will push back against any curvature in much the same way as a ball pushed uphill will push back to minimize its gravitational potential energy.
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==Effects of surface tension==
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'''A'''. Beading of rain water on a waxy surface, such as a leaf. Water adheres weakly to wax and strongly to itself, so water clusters into drops. Surface tension gives them their near-spherical shape, because a sphere has the smallest possible [[surface area to volume ratio]].
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'''B'''. Formation of [[Drop (liquid)|drops]] occurs when a mass of liquid is stretched. The animation shows water adhering to the faucet gaining mass until it is stretched to a point where the surface tension can no longer bind it to the faucet. It then separates and surface tension forms the drop into a sphere. If a stream of water was running from the faucet, the stream would break up into drops during its fall. Gravity stretches the stream, then surface tension pinches it into spheres.<ref name="MIT5">{{cite web|url=http://web.mit.edu/1.63/www/Lec-notes/Surfacetension/Lecture5.pdf|format=PDF|title=MIT Lecture Notes on Surface Tension, lecture 5|accessdate=April 1, 2007|date=May 2004|publisher=Massachusetts Institute of Technology|author=John W. M. Bush}}</ref>
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'''C'''. Flotation of objects denser than water occurs when the object is nonwettable and its weight is small enough to be borne by the forces arising from surface tension.<ref name="white"/> For example, [[Gerridae|water striders]] use surface tension to walk on the surface of a pond. The surface of the water behaves like an elastic film: the insect's feet cause indentations in the water's surface, increasing its surface area.<ref name="MIT3">{{cite web|url=http://web.mit.edu/1.63/www/Lec-notes/Surfacetension/Lecture3.pdf|format=PDF|title=MIT Lecture Notes on Surface Tension, lecture 3|accessdate=April 1, 2007|publisher=Massachusetts Institute of Technology|author=John W. M. Bush|date=May 2004}}</ref>
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'''D'''. Separation of oil and water (in this case, water and liquid wax) is caused by a tension in the surface between dissimilar liquids. This type of surface tension is called "interface tension", but its chemistry is the same.
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'''E'''. [[Tears of wine]] is the formation of drops and rivulets on the side of a glass containing an alcoholic beverage. Its cause is a complex interaction between the differing surface tensions of water and [[ethanol]]; it is induced by a combination of surface tension modification of water by [[ethanol]] together with ethanol [[evaporating]] faster than water.
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Image:Dew 2.jpg|'''A.''' Water beading on a leaf
 
Image:Water drop animation enhanced small.gif|'''B.''' Water dripping from a tap
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File:WaterstriderEnWiki.jpg|'''C.''' [[Water strider]]s stay atop the liquid because of surface tension
 
File:1990s Mathmos Astro.jpg|'''D.''' [[Lava lamp]] with interaction between dissimilar liquids; water and liquid wax
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Image:Wine legs shadow.jpg|'''E.''' Photo showing the "[[tears of wine]]" phenomenon.
 
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===Surfactants===
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Surface tension is visible in other common phenomena, especially when [[surfactant]]s are used to decrease it:


* [[Soap bubble]]s have very large surface areas with very little mass. Bubbles in pure water are unstable. The addition of surfactants, however, can have a stabilizing effect on the bubbles (see [[Marangoni effect]]). Notice that surfactants actually reduce the surface tension of water by a factor of three or more.
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* [[Emulsion]]s are a type of solution in which surface tension plays a role. Tiny fragments of oil suspended in pure water will spontaneously assemble themselves into much larger masses. But the presence of a surfactant provides a decrease in surface tension, which permits stability of minute droplets of oil in the bulk of water (or vice versa).{{Clear right}}
  <li>[http://www.achicourtautrement.fr/spip.php?article451/ http://www.achicourtautrement.fr/spip.php?article451/]</li>
 
 
== Physics ==
  <li>[http://cangyou.org/forum.php?mod=viewthread&tid=90843 http://cangyou.org/forum.php?mod=viewthread&tid=90843]</li>
 
 
=== Physical Units ===
  <li>[http://enseignement-lsf.com/spip.php?article65#forum18314622 http://enseignement-lsf.com/spip.php?article65#forum18314622]</li>
Surface tension, usually represented by the symbol ''[[gamma|γ]]'', is measured in [[force]]s per [[length|unit length]]. Its [[International System of Units|SI]] unit is [[newton (unit)|newton]] per meter but the [[cgs]] unit of [[dyne]] per cm is also used.<ref name="MIT1">{{cite web|url=http://web.mit.edu/1.63/www/Lec-notes/Surfacetension/Lecture1.pdf|format=PDF|title=MIT Lecture Notes on Surface Tension, lecture 1|accessdate=April 1, 2007|publisher=Massachusetts Institute of Technology|author=John W. M. Bush|date=April 2004}}</ref>
 
 
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:<math> \gamma = 1 ~\frac{dyn}{cm} = 1 ~\frac{erg}{cm^2} = 0.001~\frac{N}{m} = 0.001~\frac{J}{m^2}</math>
 
 
  <li>[http://aq2sw.com/forum.php?mod=viewthread&tid=1997943 http://aq2sw.com/forum.php?mod=viewthread&tid=1997943]</li>
=== Surface area growth ===
 
[[File:Surface growing.png|thumb|right|This diagram illustrates the force necessary to increase the surface area. This force is proportional to the surface tension.]]
</ul>
 
In case of liquids, surface tension may be equivalently defined either through force or through energy.
 
'''In terms of force:''' surface tension <math>\gamma</math> of a liquid is one-half the force per unit length required to keep still a movable side of a frame over which the liquid is stretched (say, into a thin film). To visualize this, imagine a rectangular frame which is composed of three unmovable sides that form a "U" shape, and the fourth, movable side that can slide, along the two parallel unmovable sides, either towards or away from the unmovable "bottom" side of the "U." Now imagine that a liquid is stretched into a thin film on this frame, much like soap water gets stretched over a bubble-blowing ring after the ring is dunked into soapy water. Then it is observed<ref name="MIT_Non-Newtonian">{{cite web
| title = Mechanical definition of surface tension
| url = http://web.mit.edu/nnf/education/wettability/definition.html
| accessdate = Dec 16, 2013
}}</ref>
that the movable side will be pulled by the film towards the "bottom" of the "U"; the force <math>F</math> required to stop the movable side from sliding turns out to be proportional to the length <math>L</math> of the movable side. Thus the ratio <math>F/L</math> depends only on the intrinsic properties of the liquid (composition, temperature, etc.), but not on its geometry; for example, if the frame has a more complicated shape, the ratio <math>F/L</math>, with <math>L</math> the length of the movable side and <math>F</math> the force required to stop it from sliding, is found to be the same for all shapes. We therefore define the surface tension as
 
:<math>\gamma=\frac{1}{2}\frac{F}{L}</math>.
 
The reason for the <math>1/2</math> is that the film has two sides, each of which contributes equally to the force; so the force contributed by each side is <math>\gamma L=F/2</math>, which adds up to a total force of <math>F</math>.
 
'''In terms of energy:''' surface tension <math>\gamma</math> of a liquid is the ratio of 1. the change in the energy of the liquid and 2. the change in the surface area of the liquid (that led to the change in energy). This can be easily related to the previous definition in terms of force:<ref name="MIT_Non-Newtonian" /> if <math>F</math>  is the force required to stop the side from ''starting'' to slide, then this is also the force that would keep the side in the state of ''sliding at a constant speed'' (by Newton's Second Law). But if the side is moving, then 1. the surface area of the stretched liquid is increasing while 2. the applied force is doing work on the liquid. This means that increasing the surface area increases the energy of the film. The work done by the force <math>F</math> in moving the side by distance <math>\Delta x</math> is  <math>W=F \Delta x</math>; at the same time the total area of the film increases by <math>\Delta A =2 L \Delta x</math> (the factor of 2 is here because the liquid has two sides, two surfaces). Thus, multiplying both the numerator and the denominator of <math>\gamma=(1/2)F/L</math> by <math>\Delta x</math>, we get
 
:<math>\gamma=\frac{F}{2L}=\frac{F \Delta x}{2 L \Delta x}=\frac{W}{\Delta A} </math>.
 
This work <math>W</math> is, by the [[Potential Energy#Work and potential energy|usual arguments]], interpreted as being stored as potential energy. Consequently surface tension can be also measured in SI system as joules per square meter and in the [[Centimetre gram second system of units|cgs]] system as [[erg]]s per cm<sup>2</sup>. Since mechanical systems try to find a state of minimum potential energy, a free droplet of liquid naturally assumes a spherical shape, which has the minimum surface area for a given volume.
 
The equivalence of measurement of energy per unit area to force per unit length can be proven by [[dimensional analysis]].<ref name="s_z"/>
 
<!-- A related quantity is the [[energy of cohesion]], which is the energy released when two bodies of the same liquid become joined by a boundary of unit area. Since this process involves the removal of a unit area of surface from each of the two bodies of liquid, the energy of cohesion is equal to twice the surface energy. A similar concept, the [[energy of adhesion]], applies to two bodies of different liquids. Energy of adhesion is linked to the surface tension of an interface between two liquids. <math>\scriptstyle W_{adh}\ =\ W_{coh}^{\alpha}+W_{coh}^\beta-\gamma_{\alpha}^\beta</math>
 
See also [[Cassie's law]]. -->{{Clear right}}
 
===Surface curvature and pressure===
[[Image:CurvedSurfaceTension.png|thumb|385px|right|Surface tension forces acting on a tiny (differential) patch of surface. ''δθ<sub>x</sub>'' and ''δθ<sub>y</sub>'' indicate the amount of bend over the dimensions of the patch. Balancing the tension forces with pressure leads to the [[Young–Laplace equation]]]]
 
If no force acts normal to a tensioned surface, the surface must remain flat. But if the pressure on one side of the surface differs from pressure on the other side, the pressure difference times surface area results in a normal force. In order for the surface tension forces to cancel the force due to pressure, the surface must be curved. The diagram shows how surface curvature of a tiny patch of surface leads to a net component of surface tension forces acting normal to the center of the patch. When all the forces are balanced, the resulting equation is known as the [[Young–Laplace equation]]:<ref name="cwp"/>
 
::<math>\Delta p\ =\ \gamma \left( \frac{1}{R_x} + \frac{1}{R_y} \right)</math>
 
where:
:*Δ''p'' is the pressure difference.
:*''<math>\scriptstyle\gamma</math>'' is surface tension.
:*''R<sub>x</sub>'' and ''R<sub>y</sub>'' are radii of curvature in each of the axes that are parallel to the surface.
 
The quantity in parentheses on the right hand side is in fact (twice) the [[mean curvature]] of the surface (depending on normalisation).
 
Solutions to this equation determine the shape of water drops, puddles, menisci, soap bubbles, and all other shapes determined by surface tension (such as the shape of the impressions that a water strider's feet make on the surface of a pond).
 
The table below shows how the internal pressure of a water droplet increases with decreasing radius. For not very small drops the effect is subtle, but the pressure difference becomes enormous when the drop sizes approach the molecular size. (In the limit of a single molecule the concept becomes meaningless.)
 
{| class="toccolours" border="1" style="float: center; clear: right; margin: 0 0 1em 1em; border-collapse: collapse;"
|-
! style="text-align:center; background:#c0c0f0;" colspan="5"|'''Δ''p'' for water drops of different radii at [[Standard conditions for temperature and pressure|STP]]'''
|-
| style="width:120px; text-align:center;"|Droplet radius
| style="width:120px; text-align:center;"|1&nbsp;mm
| style="width:120px; text-align:center;"|0.1&nbsp;mm
| style="width:120px; text-align:center;"|1 [[micrometre|μm]]
| style="width:120px; text-align:center;"|10 [[nanometer|nm]]
|-
| style="text-align:center;"| Δ''p'' ([[Atmosphere (unit)|atm]])|| style="text-align:center;"| 0.0014|| style="text-align:center;"| 0.0144|| style="text-align:center;"|1.436|| style="text-align:center;"| 143.6
|}
{{Clear right}}
 
=== Floating objects ===
[[Image:Surface Tension Diagram.svg|thumb|250px|right|Cross-section a needle floating on the surface of water. F<sub>w</sub> is the weight and F<sub>s</sub> are surface tension resultant forces.]]
 
When an object is placed on a liquid, its weight F<sub>w</sub> depresses the surface, and is balanced by the surface tension forces on either side F<sub>s</sub>, which are each parallel to the water's surface at the points where it contacts the object. Notice that the horizontal components of the two F<sub>s</sub> arrows point in opposite directions, so they cancel each other, but the vertical components point in the same direction and therefore add up<ref name="white"/> to balance F<sub>w</sub>. The object's surface must not be wettable for this to happen, as well as the weight should be lower than the surface tension can hold.
 
:<math> F_w = 2 F_s cos \theta \Leftrightarrow \rho A_s L g = 2 \gamma \, L \, z \, cos \theta </math>
 
===Liquid surface===
[[Image:Površinska napetost milnica.jpg|thumb|Minimal surface]]
To find the shape of the [[minimal surface]] bounded by some arbitrary shaped frame using strictly mathematical means can be a daunting task. Yet by fashioning the frame out of wire and dipping it in soap-solution, a locally minimal surface will appear in the resulting soap-film within seconds.<ref name="s_z"/><ref>{{Cite journal|last1 = Aaronson|first1 = Scott|contribution = NP-Complete Problems and physical reality.|title = SIGACT News|contribution-url = http://www.scottaaronson.com/papers/npcomplete.pdf}}</ref>
 
The reason for this is that the pressure difference across a fluid interface is proportional to the [[mean curvature]], as seen in the [[Young-Laplace equation]]. For an open soap film, the pressure difference is zero, hence the mean curvature is zero, and minimal surfaces have the property of zero mean curvature.
 
{{Clear right}}
 
===Contact angles===
{{Main|Contact angle}}
The surface of any liquid is an interface between that liquid and some other medium.<ref group=note>In a [[mercury barometer]], the upper liquid surface is an interface between the liquid and a vacuum containing some molecules of evaporated liquid.</ref> The top surface of a pond, for example, is an interface between the pond water and the air. Surface tension, then, is not a property of the liquid alone, but a property of the liquid's interface with another medium. If a liquid is in a container, then besides the liquid/air interface at its top surface, there is also an interface between the liquid and the walls of the container. The surface tension between the liquid and air is usually different (greater than) its surface tension with the walls of a container. And where the two surfaces meet, their geometry must be such that all forces balance.<ref name="s_z"/><ref name="cwp"/>
 
{| style="float:right;"
|-
|[[Image:SurfTensionContactAngle.png|thumb|255px|right|Forces at contact point shown for contact angle greater than 90° (left) and less than 90° (right)]]
|}
 
Where the two surfaces meet, they form a [[contact angle]], <math>\scriptstyle \theta</math>, which is the angle the tangent to the surface makes with the solid surface. The diagram to the right shows two examples. Tension forces are shown for the liquid-air interface, the liquid-solid interface, and the solid-air interface. The example on the left is where the difference between the liquid-solid and solid-air surface tension, <math>\scriptstyle \gamma_{\mathrm{ls}} - \gamma_{\mathrm{sa}} </math>, is less than the liquid-air surface tension, <math>\scriptstyle \gamma_{\mathrm{la}} </math>, but is nevertheless positive, that is
 
:<math>\gamma_{\mathrm{la}}\ >\ \gamma_{\mathrm{ls}} - \gamma_{\mathrm{sa}}\ >\ 0</math>
 
In the diagram, both the vertical and horizontal forces must cancel exactly at the contact point, known as [[Mechanical equilibrium|equilibrium]]. The horizontal component of <math>\scriptstyle f_\mathrm{la}</math> is canceled by the adhesive force, <math>\scriptstyle f_\mathrm{A}</math>.<ref name="s_z"/>
 
:<math>f_\mathrm{A}\ =\ f_\mathrm{la} \sin \theta</math>
 
The more telling balance of forces, though, is in the vertical direction. The vertical component of <math>\scriptstyle f_\mathrm{la}</math> must exactly cancel the force, <math>\scriptstyle f_\mathrm{ls}</math>.<ref name="s_z"/>
 
:<math>f_\mathrm{ls} - f_\mathrm{sa}\ =\ -f_\mathrm{la} \cos \theta</math>
 
{| class="toccolours" border="1" style="float: right; clear: right; margin: 0 0 1em 1em; border-collapse: collapse;"
|- style="text-align:center; background:#c0c0f0;"
! Liquid
! Solid
! Contact angle
|-
| [[water]]
| rowspan="6" |
{| cellpadding="0" cellspacing="0" border="0"
|- style="background:#f8f8f8;"
|soda-lime glass
|- style="background:#f8f8f8;"
| lead glass
|- style="background:#f8f8f8;"
| fused quartz
|}
| rowspan="6" style="text-align:center;"|0°
|-
| [[ethanol]]
|-
| [[diethyl ether]]
|-
| [[carbon tetrachloride]]
|-
| [[glycerol]]
|-
| [[acetic acid]]
|-
| rowspan="2"|[[water]]
| paraffin wax
| style="text-align:center;"|107°
|-
| silver
| style="text-align:center;"|90°
|-
| rowspan="3"| [[iodomethane|methyl iodide]]
| soda-lime glass
| style="text-align:center;"|29°
|-
| lead glass
| style="text-align:center;"|30°
|-
| fused quartz
| style="text-align:center;"|33°
|-
| [[mercury (element)|mercury]]
| soda-lime glass
| style="text-align:center;"|140°
|-
| colspan="3" style="text-align:center;"|'''Some liquid-solid contact angles'''<ref name="s_z"/>
|}
 
Since the forces are in direct proportion to their respective surface tensions, we also have:<ref name="cwp"/>
 
:<math>\gamma_\mathrm{ls} - \gamma_\mathrm{sa}\ =\ -\gamma_\mathrm{la} \cos \theta</math>
 
where
:* <math>\scriptstyle \gamma_\mathrm{ls}</math> is the liquid-solid surface tension,
:* <math>\scriptstyle \gamma_\mathrm{la}</math> is the liquid-air surface tension,
:* <math>\scriptstyle \gamma_\mathrm{sa}</math> is the solid-air surface tension,
:* <math>\scriptstyle \theta</math> is the contact angle, where a concave [[meniscus]] has contact angle less than 90° and a convex meniscus has contact angle of greater than 90°.<ref name="s_z">Sears, Francis Weston; Zemanski, Mark W. ''University Physics 2nd ed.'' Addison Wesley 1955</ref>
 
This means that although the difference between the liquid-solid and solid-air surface tension, <math>\scriptstyle \gamma_\mathrm{ls} - \gamma_\mathrm{sa}</math>, is difficult to measure directly, it can be inferred from the liquid-air surface tension, <math>\scriptstyle \gamma_\mathrm{la}</math>, and the equilibrium contact angle, <math>\scriptstyle \theta</math>, which is a function of the easily measurable advancing and receding contact angles (see main article [[contact angle]]).
 
This same relationship exists in the diagram on the right. But in this case we see that because the contact angle is less than 90°, the liquid-solid/solid-air surface tension difference must be negative:
 
:<math>\gamma_\mathrm{la}\ >\ 0\ >\ \gamma_\mathrm{ls} - \gamma_\mathrm{sa}</math>
 
====Special contact angles====
Observe that in the special case of a water-silver interface where the contact angle is equal to 90°, the liquid-solid/solid-air surface tension difference is exactly zero.
 
Another special case is where the contact angle is exactly 180°. Water with specially prepared [[polytetrafluoroethylene|Teflon]] approaches this.<ref name="cwp"/> Contact angle of 180° occurs when the liquid-solid surface tension is exactly equal to the liquid-air surface tension.
 
:<math>\gamma_{\mathrm{la}}\ =\ \gamma_{\mathrm{ls}} - \gamma_\mathrm{sa}\ >\ 0\qquad \theta\ =\ 180^\circ</math>
{{Clear right}}
 
==Methods of measurement==
[[Image:m500.jpg|thumb|right|300px|Surface tension can be measured using the pendant drop method on a [[goniometer]].]]
 
Because surface tension manifests itself in various effects, it offers a number of paths to its measurement. Which method is optimal depends upon the nature of the liquid being measured, the conditions under which its tension is to be measured, and the stability of its surface when it is deformed.
 
* [[du Noüy ring method|Du Noüy Ring method]]: The traditional method used to measure surface or interfacial tension. Wetting properties of the surface or interface have little influence on this measuring technique. Maximum pull exerted on the ring by the surface is measured.<ref name="phywe"/>
 
* [[Du Noüy-Padday method]]: A minimized version of Du Noüy method uses a small diameter metal needle instead of a ring, in combination with a high sensitivity microbalance to record maximum pull. The advantage of this method is that very small sample volumes (down to few tens of microliters) can be measured with very high precision, without the need to correct for [[buoyancy]] (for a needle or rather, rod, with proper geometry). Further, the measurement can be performed very quickly, minimally in about 20 seconds. First commercial multichannel tensiometers [CMCeeker] were recently built based on this principle.
 
* [[Wilhelmy plate|Wilhelmy plate method]]: A universal method especially suited to check surface tension over long time intervals. A vertical plate of known perimeter is attached to a balance, and the force due to wetting is measured.<ref name="ksv">{{cite web|url=http://www.ksvinc.com/surface_tension1.htm|title=Surface and Interfacial Tension|accessdate=2007-09-08|publisher=Langmuir-Blodgett Instruments}}</ref>
 
* [[Spinning drop method]]: This technique is ideal for measuring low interfacial tensions. The diameter of a drop within a heavy phase is measured while both are rotated.
 
* [[Pendant drop method]]: Surface and interfacial tension can be measured by this technique, even at elevated temperatures and pressures. Geometry of a drop is analyzed optically. For details, see [[Drop (liquid)|Drop]].<ref name="ksv"/>
 
* [[Bubble pressure method]] (Jaeger's method): A measurement technique for determining surface tension at short surface ages. Maximum pressure of each bubble is measured.
 
* Drop volume method: A method for determining interfacial tension as a function of interface age. Liquid of one density is pumped into a second liquid of a different density and time between drops produced is measured.<ref name="tension">{{cite web|url=http://lauda.de/hosting/lauda/webres.nsf/urlnames/graphics_tvt2/$file/Tensio-dyn-meth-e.pdf|format=PDF|title=Surfacants at interfaces|accessdate=2007-09-08|publisher=lauda.de}}</ref>
 
* Capillary rise method: The end of a capillary is immersed into the solution. The height at which the solution reaches inside the capillary is related to the surface tension by the equation [[#Liquid in a vertical tube|discussed below]].<ref name="calvert">{{cite web|url=http://mysite.du.edu/~jcalvert/phys/surftens.htm|title=Surface Tension (physics lecture notes)|author=Calvert, James B|accessdate=2007-09-08|publisher=University of Denver}}</ref>
 
* [[Stalagmometric method]]: A method of weighting and reading a drop of liquid.
 
* [[Sessile drop method]]: A method for determining surface tension and [[density]] by placing a drop on a substrate and measuring the [[contact angle]] (see [[Sessile drop technique]]).<ref name="dp">{{cite web|url=http://www.dataphysics.de/english/messmeth_sessil.htm|title=Sessile Drop Method|accessdate=2007-09-08|publisher=Dataphysics |archiveurl = http://web.archive.org/web/20070808082309/http://www.dataphysics.de/english/messmeth_sessil.htm |archivedate = August 8, 2007}}</ref>
 
* Vibrational frequency of levitated drops: The natural frequency of vibrational oscillations of magnetically levitated drops has been used to measure the surface tension of superfluid <sup>4</sup>He. This value is estimated to be 0.375 dyn/cm at T = 0 K.<ref>{{cite journal|doi=10.1103/PhysRevB.66.214504|title=Surface tension of liquid 4He as measured using the vibration modes of a levitated drop|year=2002|last1=Vicente|first1=C.|last2=Yao|first2=W.|last3=Maris|first3=H.|last4=Seidel|first4=G.|journal=Physical Review B|volume=66|issue=21|bibcode = 2002PhRvB..66u4504V }}</ref>
 
==Effects==
 
===Liquid in a vertical tube===
{{Main|Capillary action}}
[[Image:HgBarometer.gif|thumb|160px|right|Diagram of a mercury barometer]]
 
An old style [[mercury (element)|mercury]] [[barometer]] consists of a vertical glass tube about 1&nbsp;cm in diameter partially filled with mercury, and with a vacuum (called [[Evangelista Torricelli|Torricelli]]'s vacuum) in the unfilled volume (see diagram to the right). Notice that the mercury level at the center of the tube is higher than at the edges, making the upper surface of the mercury dome-shaped. The center of mass of the entire column of mercury would be slightly lower if the top surface of the mercury were flat over the entire crossection of the tube. But the dome-shaped top gives slightly less surface area to the entire mass of mercury. Again the two effects combine to minimize the total potential energy. Such a surface shape is known as a convex meniscus.
 
We consider the surface area of the entire mass of mercury, including the part of the surface that is in contact with the glass, because mercury does not adhere to glass at all. So the surface tension of the mercury acts over its entire surface area, including where it is in contact with the glass. If instead of glass, the tube was made out of copper, the situation would be very different. Mercury aggressively adheres to copper. So in a copper tube, the level of mercury at the center of the tube will be lower than at the edges (that is, it would be a concave meniscus). In a situation where the liquid adheres to the walls of its container, we consider the part of the fluid's surface area that is in contact with the container to have ''negative'' surface tension. The fluid then works to maximize the contact surface area. So in this case increasing the area in contact with the container decreases rather than increases the potential energy. That decrease is enough to compensate for the increased potential energy associated with lifting the fluid near the walls of the container.
 
[[Image:CapillaryAction.svg|thumb|180px|right|Illustration of capillary rise and fall. Red=contact angle less than 90°; blue=contact angle greater than 90°]]
<!-- [[Image:Dscn3156-daisy-water 1200x900.jpg|thumb|250px|right|Surface tension prevents this flower from sinking]] -->
 
If a tube is sufficiently narrow and the liquid adhesion to its walls is sufficiently strong, surface tension can draw liquid up the tube in a phenomenon known as [[capillary action]]. The height to which the column is lifted is given by:<ref name="s_z"/>
 
::<math>h\ =\ \frac {2\gamma_\mathrm{la} \cos\theta}{\rho g r}</math>
 
where
 
:* <math>\scriptstyle h</math> is the height the liquid is lifted,
:* <math>\scriptstyle \gamma_\mathrm{la}</math> is the liquid-air surface tension,
:* <math>\scriptstyle \rho</math> is the density of the liquid,
:* <math>\scriptstyle r</math> is the radius of the capillary,
:* <math>\scriptstyle g</math> is the acceleration due to gravity,
:* <math>\scriptstyle \theta</math> is the angle of contact described above. If <math>\scriptstyle \theta</math> is greater than 90°, as with mercury in a glass container, the liquid will be depressed rather than lifted.
{{Clear}}
 
===Puddles on a surface===
[[Image:SurfTensionEdgeOfPool.png|thumb|374px|right|Profile curve of the edge of a puddle where the contact angle is 180°. The curve is given by the formula:<ref name="cwp"/> <math>\scriptstyle x - x_0 \ = \ \frac {1} {2} H \cosh^{-1}\left(\frac {H}{h}\right) - H \sqrt{1 - \frac{h^2} {H^2}}</math> where <math>\scriptstyle H \ = \ 2 \sqrt{\frac {\gamma} {g \rho}}</math>]]
[[Image:Exploring new continents 1200728.JPG|thumb|200px|right|Small puddles of water on a smooth clean surface have perceptible thickness.]]
Pouring mercury onto a horizontal flat sheet of glass results in a [[Puddle#Physics|puddle]] that has a perceptible thickness. The puddle will spread out only to the point where it is a little under half a centimetre thick, and no thinner. Again this is due to the action of mercury's strong surface tension. The liquid mass flattens out because that brings as much of the mercury to as low a level as possible, but the surface tension, at the same time, is acting to reduce the total surface area. The result of the compromise is a puddle of a nearly fixed thickness.
 
The same surface tension demonstration can be done with water, lime water or even saline, but only on a surface made of a substance to which water does not adhere. Wax is such a substance. Water poured onto a smooth, flat, horizontal wax surface, say a waxed sheet of glass, will behave similarly to the mercury poured onto glass.
 
The thickness of a puddle of liquid on a surface whose contact angle is 180° is given by:<ref name="cwp">{{Cite book|title=Capillary and Wetting Phenomena—Drops, Bubbles, Pearls, Waves|author1=Pierre-Gilles de Gennes|authorlink1=Pierre-Gilles de Gennes|author2=Françoise Brochard-Wyart|author3=David Quéré|publisher=Springer|year=2002|isbn=0-387-00592-7|others=Alex Reisinger}}</ref>
 
::<math>h\ =\ 2 \sqrt{\frac{\gamma} {g\rho}}</math>
 
where
 
:{|
| <math>\scriptstyle h</math> is the depth of the puddle in centimeters or meters.
|-
| <math>\scriptstyle \gamma</math> is the surface tension of the liquid in dynes per centimeter or newtons per meter.
|-
| <math>\scriptstyle g</math> is the acceleration due to gravity and is equal to 980&nbsp;cm/s<sup>2</sup> or 9.8&nbsp;m/s<sup>2</sup>
|-
| <math>\scriptstyle \rho</math> is the density of the liquid in grams per cubic centimeter or kilograms per cubic meter
|}
 
[[Image:Surface tension.svg|thumb|200px|right|Illustration of how lower contact angle leads to reduction of puddle depth]]
 
In reality, the thicknesses of the puddles will be slightly less than what is predicted by the above formula because very few surfaces have a contact angle of 180° with any liquid. When the contact angle is less than 180°, the thickness is given by:<ref name="cwp"/>
 
::<math>h\ =\ \sqrt{\frac{2\gamma_\mathrm{la}\left( 1 - \cos \theta \right)} {g\rho}}.</math>
 
For mercury on glass, γ<sub>Hg</sub> = 487 dyn/cm, ρ<sub>Hg</sub> = 13.5 g/cm<sup>3</sup> and θ = 140°, which gives h<sub>Hg</sub> = 0.36&nbsp;cm. For water on paraffin at 25 °C, γ = 72 dyn/cm, ρ = 1.0 g/cm<sup>3</sup>, and θ = 107° which gives h<sub>H<sub>2</sub>O</sub> = 0.44&nbsp;cm.
 
The formula also predicts that when the contact angle is 0°, the liquid will spread out into a micro-thin layer over the surface. Such a surface is said to be fully wettable by the liquid.{{Clear right}}
 
===The breakup of streams into drops===
[[Image:SurfTensWavyJet.svg|thumb|240px|right|Intermediate stage of a jet breaking into drops. Radii of curvature in the axial direction are shown. Equation for the radius of the stream is <math>\scriptstyle R\left( z \right) = R_0 + A_k \cos \left( kz \right)</math>, where <math>\scriptstyle R_0</math> is the radius of the unperturbed stream, <math>\scriptstyle A_k</math> is the amplitude of the perturbation, <math>\scriptstyle z</math> is distance along the axis of the stream, and <math>\scriptstyle k</math> is the wave number]]
 
{{Main|Plateau–Rayleigh instability}}
In day-to-day life all of us observe that a stream of water emerging from a faucet will break up into droplets, no matter how smoothly the stream is emitted from the faucet. This is due to a phenomenon called the [[Plateau–Rayleigh instability]],<ref name="cwp"/> which is entirely a consequence of the effects of surface tension.
 
The explanation of this instability begins with the existence of tiny perturbations in the stream. These are always present, no matter how smooth the stream is. If the perturbations are resolved into [[Sine wave|sinusoidal]] components, we find that some components grow with time while others decay with time. Among those that grow with time, some grow at faster rates than others. Whether a component decays or grows, and how fast it grows is entirely a function of its wave number (a measure of how many peaks and troughs per centimeter) and the radii of the original cylindrical stream.
 
==Thermodynamics==
As stated above, the mechanical work needed to increase a surface is <math>\scriptstyle dW \ = \ \gamma dA</math>. Hence at constant temperature and pressure, surface tension equals [[Gibbs free energy]] per surface area:<ref name="cwp"/>
 
::<math>\gamma = \left( \frac{\partial G}{\partial A} \right)_{T,P,n}</math>
 
where <math>\scriptstyle G</math> is Gibbs free energy and <math>\scriptstyle A</math> is the area.
 
Thermodynamics requires that all spontaneous changes of state are accompanied by a decrease in Gibbs free energy.
 
From this it is easy to understand why decreasing the surface area of a mass of liquid is always [[spontaneous process|spontaneous]] (<math>\scriptstyle \Delta G \ < \ 0</math>), provided it is not coupled to any other energy changes. It follows that in order to increase surface area, a certain amount of energy must be added.
 
Gibbs free energy is defined by the equation,<ref name="moore">{{Cite book|title=Physical Chemistry, 3rd ed|author=Moore, Walter J.|publisher=Prentice Hall|year=1962}}</ref> <math>\scriptstyle G \ = \ H \ - \ TS</math>, where <math>\scriptstyle H</math> is [[enthalpy]] and <math>\scriptstyle S</math> is [[entropy]]. Based upon this and the fact that surface tension is Gibbs free energy per unit area, it is possible to obtain the following expression for entropy per unit area:
 
::<math>\left( \frac{\partial \gamma}{\partial T} \right)_{A,P}=-S^{A}</math>
 
[[William Thomson, 1st Baron Kelvin|Kelvin's]] Equation for surfaces arises by rearranging the previous equations. It states that surface enthalpy or [[surface energy]] (different from [[Specific surface energy|surface free energy]]) depends both on surface tension and its derivative with temperature at constant pressure by the relationship.<ref name="adam">{{Cite book|title=The Physics and Chemistry of Surfaces, 3rd ed|author=Adam, Neil Kensington|publisher=Oxford University Press|year=1941}}</ref>
 
::<math> H^A\ =\ \gamma - T \left( \frac {\partial \gamma}{\partial T} \right)_P</math>
 
===Thermodynamics of soap bubbles===
The pressure inside an ideal (one surface) soap bubble can be derived from thermodynamic free energy considerations. At constant temperature and particle number, <math>dT = dN = 0</math>, the differential Helmholtz energy is given by
 
::<math>dF\ = -PdV\ + \gamma dA</math>
 
where <math>P</math> is the difference in pressure inside and outside of the bubble, and <math> \gamma </math> is the surface tension. In equilibrium, <math>dF = 0</math>, and so,
 
::<math>PdV\ = \gamma dA</math>.
 
For a spherical bubble, the volume and surface area are given simply by
::<math>V = \frac{4}{3}\pi R^3 \rightarrow dV \approx 4\pi R^2 dR</math> ,
and
::<math>A = 4\pi R^2 \rightarrow dA \approx 8\pi R dR</math> .
 
Substituting these relations into the previous expression, we find
 
::<math>P = \frac{2}{R}\gamma</math> ,
 
which is equivalent to the [[Young–Laplace equation]] when R<sub>x</sub> = R<sub>y</sub>. For real soap bubbles, the pressure is doubled due to the presence of two interfaces, one inside and one outside.
 
====Influence of temperature====
[[Image:Temperature dependence surface tension of water.svg|thumb|Temperature dependence of the surface tension between the liquid and vapor phases of pure water]]
[[Image:SFT-benzene.png|thumb|Temperature dependency of the surface tension of [[benzene]]]]
 
Surface tension is dependent on temperature. For that reason, when a value is given for the surface tension of an interface, temperature must be explicitly stated. The general trend is that surface tension decreases with the increase of temperature, reaching a value of 0 at the [[critical temperature]]. For further details see [[Eötvös rule]]. There are only empirical equations to relate surface tension and temperature:
* Eötvös:<ref name="phywe">{{cite web|url=http://www.nikhef.nl/~h73/kn1c/praktikum/phywe/LEP/Experim/1_4_05.pdf|title=Surface Tension by the Ring Method (Du Nouy Method)|accessdate=2007-09-08|publisher=PHYWE|format=PDF}}</ref><ref name="adam"/><ref name="Physical Properties Sources Index (PPSI)">{{cite web|url=http://www.ppsi.ethz.ch/fmi/xsl/eqi/eqi_property_details_en.xsl?node_id=1113|title=Physical Properties Sources Index: Eötvös Constant|accessdate=2008-11-16}}</ref>
::<math>\gamma V^{2/3}=k(T_C-T)\,\!</math>
<!-- The \,\! is to keep the formula rendered as PNG instead of HTML, the same as the Guggenheim-Katayama equation. Please do not remove it.-->
 
Here ''V'' is the molar volume of a substance, ''T<sub>C</sub> is the [[critical temperature]] and ''k'' is a constant valid for almost all substances.<ref name="phywe"/> A typical value is ''k'' = 2.1 x 10<sup>−7</sup> [J K<sup>−1</sup> mol<sup>−2/3</sup>].<ref name="phywe"/><ref name="Physical Properties Sources Index (PPSI)"/> For water one can further use ''V'' = 18&nbsp;ml/mol and ''T''<sub>C</sub> = 374°C.
 
A variant on Eötvös is described by Ramay and Shields:<ref name="moore"/>
::<math>\gamma V^{2/3} = k\left(T_C - T - 6\right)</math>
 
where the temperature offset of 6 kelvins provides the formula with a better fit to reality at lower temperatures.
 
* Guggenheim-Katayama:<ref name="adam"/>
 
::<math>\gamma = \gamma^o \left( 1-\frac{T}{T_C} \right)^n </math>
 
<math>\scriptstyle \gamma^o</math> is a constant for each liquid and n is an empirical factor, whose value is 11/9 for organic liquids. This equation was also proposed by [[Johannes Diderik van der Waals|van der Waals]], who further proposed that <math>\scriptstyle \gamma^0</math> could be given by the expression, <math>\scriptstyle K_2 T^{\frac {1}{3}}_c P^{\frac {2}{3}}_c</math>, where <math>\scriptstyle K_2</math> is a universal constant for all liquids, and <math>\scriptstyle P_c</math> is the [[critical pressure]] of the liquid (although later experiments found <math>\scriptstyle K_2</math> to vary to some degree from one liquid to another).<ref name="adam"/>
 
Both Guggenheim-Katayama and Eötvös take into account the fact that surface tension reaches 0 at the critical temperature, whereas Ramay and Shields fails to match reality at this endpoint.
 
====Influence of solute concentration====
Solutes can have different effects on surface tension depending on their structure:
* Little or no effect, for example [[sugar]]
* Increase surface tension, [[inorganic compounds|inorganic salts]]
* Decrease surface tension progressively, [[alcohols]]
* Decrease surface tension and, once a minimum is reached, no more effect: [[surfactants]]
 
What complicates the effect is that a solute can exist in a different concentration at the surface of a solvent than in its bulk. This difference varies from one solute/solvent combination to another.
 
[[Gibbs isotherm]] states that:<ref name="moore"/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <math>\Gamma\ =\ - \frac{1}{RT} \left( \frac{\partial \gamma}{\partial \ln C} \right)_{T,P} </math>
 
* <math>\scriptstyle \Gamma</math> is known as surface concentration, it represents excess of solute per unit area of the surface over what would be present if the bulk concentration prevailed all the way to the surface. It has units of mol/m<sup>2</sup>
 
* <math>\scriptstyle C</math> is the concentration of the substance in the bulk solution.
 
* <math>\scriptstyle R</math> is the [[gas constant]] and <math>\scriptstyle T</math> the [[temperature]]
 
Certain assumptions are taken in its deduction, therefore Gibbs isotherm can only be applied to ideal (very dilute) solutions with two components.
 
====Influence of particle size on vapor pressure====
{{See also|Gibbs–Thomson effect}}
The [[Clausius–Clapeyron relation]] leads to another equation also attributed to Kelvin, as the [[Kelvin equation]]. It explains why, because of surface tension, the [[vapor pressure]] for small droplets of liquid in suspension is greater than standard vapor pressure of that same liquid when the interface is flat. That is to say that when a liquid is forming small droplets, the equilibrium concentration of its vapor in its surroundings is greater. This arises because the pressure inside the droplet is greater than outside.<ref name="moore"/>
 
::<math>P_v^{fog}=P_v^o e^{\frac{V 2\gamma}{RT r_k}}</math>
 
[[Image:TinyDropletMolecules.png|thumb|250px|right|Molecules on the surface of a tiny droplet (left) have, on average, fewer neighbors than those on a flat surface (right). Hence they are bound more weakly to the droplet than are flat-surface molecules.]]
 
:*<math>\scriptstyle P_v^o</math> is the standard vapor pressure for that liquid at that temperature and pressure.
:*<math>\scriptstyle V</math> is the molar volume.
:*<math>\scriptstyle R</math> is the [[gas constant]]
 
<math>r_k</math> is the Kelvin radius, the radius of the droplets.
 
The effect explains [[supersaturation]] of vapors. In the absence of [[nucleation]] sites, tiny droplets must form before they can evolve into larger droplets. This requires a vapor pressure many times the vapor pressure at the [[phase transition]] point.<ref name="moore"/>
 
This equation is also used in [[catalyst]] chemistry to assess [[Mesoporous material|mesoporosity]] for solids.<ref name="Handbook">G. Ertl, H. Knözinger and J. Weitkamp; ''Handbook of heterogeneous catalysis,'' Vol. 2, page 430; Wiley-VCH; Weinheim; 1997 ISBN 3-527-31241-2</ref>
 
The effect can be viewed in terms of the average number of molecular neighbors of surface molecules (see diagram).
 
The table shows some calculated values of this effect for water at different drop sizes:
 
{| class="toccolours" border="1" style="float: center; clear: right; margin: 0 0 1em 1em; border-collapse: collapse;"
|-
! style="text-align:center; background:#c0c0f0;" colspan="5"|''P''/''P''<sub>0</sub> for water drops of different radii at [[Standard conditions for temperature and pressure|STP]]<ref name="adam"/>
|- style="text-align:center;"
| style="width:120px; "|Droplet radius (nm)
| style="width:120px; "|1000
| style="width:120px; "|100
| style="width:120px; "|10
| style="width:120px; "|1
|- style="text-align:center;"
|| ''P''/''P''<sub>0</sub>|| style="text-align:center;"| 1.001|| style="text-align:center;"| 1.011|| style="text-align:center;"|1.114|| style="text-align:center;"| 2.95
|}
 
The effect becomes clear for very small drop sizes, as a drop of 1&nbsp;nm radius has about 100 molecules inside, which is a quantity small enough to require a [[quantum mechanics]] analysis.
 
==Data table==
{| class="wikitable sortable" style="margin:0; text-align: right;"
|+ style="background:#C0C0F0; border: 1px solid #AAA" |Surface tension of various liquids in [[dyne|dyn]]/cm against air<ref>''Lange's Handbook of Chemistry (1967) 10th ed.'' pp 1661–1665 ISBN 0-07-016190-9 (11th ed.)</ref><br>Mixture compositions denoted "%" are by mass<br> dyn/cm is equivalent to the [[SI units]] of mN/m (millinewton per meter)
|-
! Liquid !! Temperature °C!! Surface tension, ''γ''
|-
| [[Acetic acid (data page)|Acetic acid]] || 20 || 27.60
|-
| Acetic acid (40.1%) + Water || 30 || 40.68
|-
| Acetic acid (10.0%) + Water || 30 || 54.56
|-
| [[Acetone (data page)|Acetone]] || 20 || 23.70
|-
| [[Diethyl ether (data page)|Diethyl ether]] || 20 || 17.00
|-
| [[Ethanol (data page)|Ethanol]] || 20 || 22.27
|-
| Ethanol (40%) + Water || 25 || 29.63
|-
| Ethanol (11.1%) + Water || 25 || 46.03
|-
| [[Glycerol (data page)|Glycerol]] || 20 || 63.00
|-
| [[Hexane (data page)|''n''-Hexane]] || 20 || 18.40
|-
| [[Hydrochloric acid]] 17.7[[Molar solution|M]] aqueous solution || 20 || 65.95
|-
| [[Isopropanol (data page)|Isopropanol]] || 20 || 21.70
|-
| [[Helium|Liquid helium II]] || -273 || <ref>[http://prola.aps.org/abstract/PR/v163/i1/p200_1 On the Surface Tension of Liquid Helium II]</ref> 0.37
|-
| [[Nitrogen|Liquid nitrogen]] || -196 || 8.85
|-
| [[Mercury (element)|Mercury]] || 15 || 487.00
|-
| [[Methanol (data page)|Methanol]] || 20 || 22.60
|-
| [[Octane|''n''-Octane]] || 20 || 21.80
|-
| [[Sodium chloride]] 6.0[[Molar solution|M]] aqueous solution || 20 || 82.55
|-
| [[Sucrose]] (55%) + water || 20 || 76.45
|-
| [[Water (data page)|Water]] || 0 || 75.64
|-
| Water || 25 || 71.97
|-
| Water || 50 || 67.91
|-
| Water || 100 || 58.85
|-
| [[Toluene]]  || 25 || 27.73
|-
|}
 
==See also==
{{portal|Underwater diving}}
{{colbegin|2}}
* [[Anti-fog]]
* [[Capillary wave]] — short waves on a water surface, governed by surface tension and inertia
* [[Cheerio effect]] — the tendency for small wettable floating objects to attract one another.
* [[Cohesion (chemistry)|Cohesion]]
* Dimensionless numbers
** [[Eötvös number|Bond number or Eötvös number]]
** [[Capillary number]]
** [[Marangoni number]]
** [[Weber number]]
* [[Dortmund Data Bank]] — contains experimental temperature-dependent surface tensions
* [[Electrodipping force]]
* [[Electrowetting]]
* [[Electrocapillarity]]
* [[Eötvös rule]] — a rule for predicting surface tension dependent on temperature
* [[Fluid pipe]]
* [[Hydrostatic equilibrium]]—the effect of gravity pulling matter into a round shape
* [[Interface (chemistry)]]
* [[Meniscus]] — surface curvature formed by a liquid in a container
* [[Mercury beating heart]] — a consequence of inhomogeneous surface tension
* [[Microfluidics]]
* [[Sessile drop technique]]
* [[Sow-Hsin Chen]]
* [[Specific surface energy]] — same as surface tension in isotropic materials.
* [[Spinning drop method]]
* [[Stalagmometric method]]
* [[Surface pressure#Physical chemistry|Surface pressure]]
* [[Surface science]]
* [[Surface tension values]]
* [[Surfactant]]s — substances which reduce surface tension.
* [[Szyszkowski equation]] — Calculating surface tension of aqueous solutions
* [[Tears of wine]] — the surface tension induced phenomenon seen on the sides of glasses containing alcoholic beverages.
* [[Tolman length]] — leading term in correcting the surface tension for curved surfaces.
* [[Wetting]] and [[dewetting]]
{{colend}}
 
==Gallery of effects==
<gallery perrow=4 widths=160px heights=120px>
Image:UnstableLiquidSheet.jpg|Breakup of a moving sheet of water bouncing off of a spoon.
Image:SurfaceTension.jpg|Photo of flowing water adhering to a hand. Surface tension creates the sheet of water between the flow and the hand.
Image:Ggb in soap bubble 1.jpg|A soap bubble balances surface tension forces against internal [[pneumatic]] [[pressure]].
Image:2006-01-15 coin on water.jpg|Surface tension prevents a coin from sinking: the coin is indisputably denser than water, so it must be displacing a volume greater than its own for [[buoyancy]] to balance mass.
Image:Dscn3156-daisy-water 1200x900.jpg|A daisy. The entirety of the flower lies below the level of the (undisturbed) free surface. The water rises smoothly around its edge. Surface tension prevents water filling the air between the petals and possibly submerging the flower.
Image:Surface Tension 01.jpg|A metal paper clip floats on water. Several can usually be carefully added without overflow of water.
Image:3_Moeda_(5).jpg|An aluminium coin floats on the surface of the water at 10 °C. Any extra weight would drop the coin to the bottom.
Image:Paperclip floating on water (with 'contour lines').jpg|A metal paperclip floating on water. A grill in front of the light has created the 'contour lines' which show the deformation in the water surface caused by the metal paper clip.
</gallery>
 
==Notes==
<references group=note />
 
==References==
{{Reflist|colwidth=35em}}
 
==External links==
{{Commons|Surface tension}}
* [http://hyperphysics.phy-astr.gsu.edu/hbase/surten.html On surface tension and interesting real-world cases]
* [http://web.mit.edu/1.63/www/Lec-notes/Surfacetension/ MIT Lecture Notes on Surface Tension]
* [http://www.kayelaby.npl.co.uk/general_physics/2_2/2_2_5.html Surface Tensions of Various Liquids]
* [http://ddbonline.ddbst.de/DIPPR106SFTCalculation/DIPPR106SFTCalculationCGI.exe Calculation of temperature-dependent surface tensions for some common components]
* [http://www.aim.env.uea.ac.uk/aim/surftens/surftens.php Surface Tension Calculator For Aqueous Solutions] Containing the Ions H<sup>+</sup>, NH<sub>4</sub><sup>+</sup>, Na<sup>+</sup>, K<sup>+</sup>, Mg<sup>2+</sup>, Ca<sup>2+</sup>, SO<sub>4</sub><sup>2–</sup>, NO<sub>3</sub><sup>–</sup>, Cl<sup>–</sup>, CO<sub>3</sub><sup>2–</sup>, Br<sup>–</sup> and OH<sup>–</sup>.
* [http://www.magnet.fsu.edu/education/community/slideshows/bubblewall/index.html The Bubble Wall] (Audio slideshow from the National High Magnetic Field Laboratory explaining cohesion, surface tension and hydrogen bonds)
* [http://www.scholarpedia.org/article/Interface_free_energy C. Pfister: Interface Free Energy. Scholarpedia 2010] (from first principles of statistical mechanics)
 
{{Physics-footer}}
{{Diving medicine, physiology and physics}}
{{Good article}}
 
{{DEFAULTSORT:Surface Tension}}
[[Category:Concepts in physics]]
[[Category:Fluid mechanics]]
[[Category:Surface chemistry]]
 
{{Link FA|hu}}
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Revision as of 20:42, 3 March 2014

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