Fluid Specific Enthalpy is the total energy in a system due to pressure and temperature per unit of mass in the fluid. And is denoted by hf. Fluid Specific Enthalpy is usually measured using the Kilojoule per Kilogram for Heat of Combustion (per Mass). Note that the value of Fluid Specific Enthalpy is always positive. Typically, the value of Fluid Specific Enthalpy is greater than 0.