What is meant by surface barrier ?

What is meant by surface energy? Give the expression for surface energy.

What is the meant by surface film? How many surface film are there in drop?

What is the meant by surface film? How many surface film are there in a bubble?

explain what is meant by surface energy of a liquid. Show that surface energy per unit area is numerically equal to the surface tension.

Answer the following questions What is meant by surface activity?Name three chemicals responsible for the surface activity of various detergents