Question

Explain surface tension and viscocity by giving one example.

Answer 1

Surface tension is the attractive force exerted upon the surface molecules of a liquid by the molecules beneath it,that tends to draw the surface molecules of liquid into the bulk of liquid and makes the liquid assume the shape having least surface area.

It is a physical property equal to amount of force per unit area necessary to expand the surface of liquid.

The units of surface tension are either energy per unit area.

Example: The rounded shape of water droplets on a surface is due to surface tension.

Viscosity:It is defined as the fluid's internal resistance to flow.

When the intermolecular forces of attraction are strong within a liquid or gas,there is larger viscosity.

Example:In a race of water and honey down the plate,water flows faster than honey as water is less viscous than honey.