Which of the following phenomena are caused due to the characteristic property of liquids called surface tension ?

Options

A. Small drops of mercury form spherical beads instead of spreading on the surface.
B. Particles of soil at the bottom of river remain separated but they stick together when taken out.
C. A liquid rise (or fall) in a thin capillary as soon as the capillary touches the surface of the liquid.
D. All of these.

Answer

D

Explanation

Liquids tend to minimize their surface area , i.e., liquids tend to thave minimum number of molecules at their surface. This is because the molecules on the surface experience a net downward force and have more energy than the molecules in the bulk, which do not experience any net force. Moist soil grains are pulled together because the surface area of thin film of water is reduced.