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Describe the liquid surface properties? Liquid surface properties are defined here: Liquid surface properties Surface film It is the top most layer of liquid at rest with thickness equal to molecular range. Surface tension 1) It is the property of the liquid by virtue of which the free surface of the liquid at rest tends to have the minimum surface area and as such it behaves as if covered with a stretched membrane. 2) Quantitatively, surface tension of a liquid is measured as the  force  acting per unit length of a line imagined to be drawn tangentially anywhere on the free surface of the liquid at rest. It acts at the right angle to this line on both the sides and along the tangent to the liquid surface. i.e.  S = F/l 3) Surface tension of a  liquid  is also defined as the amount of work done in increasing the free surface of liquid at rest by unity at constant temperature. i.e.  S= W/A 4) Surface tension is molecular phenomena and ...