DHvap Enthalpy of vaporisation (heat of vaporisation) the amount of heat energy
required to vaporise 1
mol of liquid at 1 atm pressure.
DHfus Enthalpy of fusion (heat of fusion) the amount of
heat energy required to melt 1 mol of
solid at 1 atm pressure.
DHsub Enthalpy of sublimation
(heat of sublimation) the
amount of heat
energy
required to vaporise
1 mol of solid at
1 atm pressure.