enthalpy

according to columbia encycloepedia....
enthalpy, measure of the heat content of a chemical or physical system; it is a quantity derived from the heat and work relations studied in thermodynamics. As a system changes from one state to another the enthalpy change, ΔH, is equal to the enthalpy of the products minus the enthalpy of the reactants.

dalam bahasa kita ianya adalah perubahan...