Liquid does not have linear or superficial expansion. Why?

Why do the liquids and gases have no linear or superficial expansion?

Define the Superficial expansion.

Coefficient of linear and coefficient of superficial expansion

If alpha, beta and gamma coefficient of linear, superficial and volume expansion respectively, tehn

The ratio among coefficient of volume expansion, superficial expansion and linear expansion i.e., gamma : beta : alpha is

The ratio among coefficient of volume expansion, superficial expansion and linear expansion i.e., gamma : beta : alpha is

What do you mean by coefficient of superficial expansion?

Why does Moon have no atmosphere?

Different liquids have same value of cubical expansion.

Why does Moon have no atmosphere'?