In case of a liquid

In case of liquids and gases bulk modulus is the only meaningful modulus of elasticity'- what do you mean by this statement?

In the case of the liquids that do not wet the walls of the vessel.

The intermolecular spaces in case of liquids are:

If the temperature increases from 0^@C to 50^@C at atmospheric pressure, which of the following processes is expected to take place more in case of liquids ?

In case of a solid or a liquid substance C_(P,m)~~C_(V,m) , but in case of gaseous substances C_(P,m) gtC_(V,m) . Explain.