As temperature rises, more and more molecules can break free, and the vapor pressure rises. A liquid boils when the vapor pressure equals the atmospheric pressure exerted on the liquid. Thus the boiling point of a liquid depends on the external, atmospheric pressure. Thus, heat is consumed during evaporation, and the liquid cools . The amount of heat required to convert 1 mole of a liquid to 1 mole of gas is called the heat of vaporization .
Amorphous solids have no long-range order.
They are a jumble. Every point in an crystalline solid is either in a unit cell or shared by two or more units cells. Simple cubic Suppose we have only one type of atom. We may imagine that each atom lies at the corner of the unit cell. Again, imagine only one type of atom.