� Enthalpy (heat) of combustion:(?Hcomb) of a substance is the enthalpy change for the complete burning of one mole of the substance
� Molar enthalpy (heat) of vaporization:(?Hvap) the heat required to vaporize one mole of a liquid
� Molar enthalpy (heat) of fusion: (?Hfus) the heat required to melt one mole of a solid
