Changes of State

Changes of state occur at particular phase transition temperatures. The heat associated with the phase transition is given by:

freezing or melting: Q = mLf   Lf is the latent heat of fusion

boiling or condensing: Q = mLv   Lv is the latent heat of vaporization

For water:   Lv = 2256 kJ/kg;   Lf = 333 kJ/kg;  c = 4.186 kJ/(kg C)