Question

Gases do not have any __________ surface.

Answer 1

Gases:

1. Gases do not have definite shape and volume.
2. There is almost no force of attraction between the molecules of a gas.
3. The dispersed nature of gas molecules does not allow the gases to have a free surface.
4. The molecules of gases possess translatory motion and move in a random direction.
5. Therefore, they do not have a fixed position and no free surface can be observed.
6. In terms of a solid, liquid, or gas, the free surface is the surface where surface tension occurs.

Hence, gases do not have any free surface.