Question

Why do solids have any number of free surfaces and gases have no free surfaces at all ? Aso compare with liquids.​

Answer 1

Answer:

In solids, molecules do not posses translatory motion. ... In gases, molecules posses translatory motion in all directions randomly. Therefore, they do not have fixed positions and do not posses translatory motion which is not random like gaseous molecules and the upper suface is free.

Explanation:

physics, a free surface is the surface of a fluid that is subject to zero parallel shear stress, such as the interface between two homogeneous fluids, for example liquid water and the air in the Earth's atmosphere. ... Such behaviour can be expressed in terms of surface tension.

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Answer 2

Answer:

In solids, molecules do not possess translatory motion. Therefore, they occupy fixed positions. As a result, they have any number of free surfaces. In gases, molecules possess translatory motion in all directions randomly

Therefore, they do not have fixed positions and do not possess definite shape. Hence, they do not have free surfaces. In liquids, molecules possess translatory motion which is not random like gaseous molecules and the upper surface is free.

Hence, they have only one free surface.