# Configuration of a Sessile Drop

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When a drop of liquid with interfacial tension is placed on a non-wetting solid surface, the drop assumes a shape that is determined by the contact angle that the liquid makes at the three-phase contact line, in accordance with the Young–Dupré equation (see [1]). Under static conditions, the drop shape must also satisfy the Young–Laplace equation of capillarity, which describes the mechanical equilibrium for two homogeneous fluids separated by an interface:

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Contributed by: Brian Higginsand Housam Binous (April 2012)

Open content licensed under CC BY-NC-SA

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References

[1] P-G. de Gennes, F. Brochard-Wyart, and D. Quere, *Capillarity and Wetting Phenomena,* New York: Springer, 2004.

[2] O. I. del Rio and A. W. Neumann, "Axisymmetric Drop Shape Analysis: Computational Method for the Measurement of Interfacial Properties from the Shape and Dimensions of Pendant and Sessile Drops,*" Journal of Colloid and Interface Science, *196, 1997* *pp 136–147.

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