Question

Dfain angle of contact . State its four characteristics

Answer 1

Characteristics of the Angle of Contact: The angle of contact is constant for a given liquid-solid pair. ... For a liquid which completely wets the solid, the angle of contact is equal to zero. When the angle of contact between the liquid and a solid surface is small (acute), the liquid is said to wet the surface.

Answer 2

Angle of contact can be defined as :

When a liquid is in contact with a solid, the angle between tangent drawn to the free surface of the liquid and the surface of solid at the point of contact measured inside the liquid.

The characteristics are as follows :

• For a given solid-liquid pair, the angle of contact is constant.

•Its value depends on nature of liquid and solid in contact.

•It depends on the medium above the free surface of liquid.

•It changes due to impurity and change in temperature.