enthalpy

noun

(physics, chemistry) In thermodynamics, a measure of the heat content of a chemical or physical system.

The enthalpy change of a reaction can be calculated using the equation ΔH = H(products) - H(reactants).

意味（1）

(physics, chemistry) In thermodynamics, a measure of the heat content of a chemical or physical system.

H=U+pV, where H is enthalpy, U is internal energy, p is pressure, and V is volume.