enthalpy
/enˈθælpɪ/noun
1- Physics a thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume. (Symbol: H)【物理】焓, 热函（符号：H）。
1.1
- the change in this quantity associated with a particular chemical process（与特定的化学反应过程相关的）焓变。
词源
1920s: from Greek enthalpein 'warm in', from en- 'within' + thalpein 'to heat'.