Surface tension is numerically equal to the surface energy.
Define surface tension.

Show that surface tension is equal to surface energy per unit area.

Small drops of water assumes spherical shape due to surface tension. Define surface tension.

Soap decreases the surface tension of water. What is surface tension?

What is the reason for surface tension?

Surface tension of lyophilic sols is

Define surface energy. What is its SI unit?

Soap decreases the surface tension of water. How does the decrease in surface tension benefit washing of clothes?