2.4.2 use the kinetic molecular theory to explain Condensation​

condensation can be found in the kinetic-molecular theory of gases . As heat is removed from a gas, the molecules of the gas move more slowly, and as a result, the intermolecular forces are strong enough to pull the molecules together to form droplets of liquid.

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.