A thermodynamic quantity equal to the sum of the internal energy of a system plus the product of the pressure-volume work done on the system: h = E + pv where h = enthalpy or total heat content, E = internal energy of the system, p = pressure, and v =volume. For the purposes here, h = sensible heat + latent heat. Sensible heat is heat that causes a change in temperature. Latent heat is the change of enthalpy during a change of state