Thermochemistry is the branch of thermodynamics that deals with the heat released or absorbed during chemical and physical processes. It allows the heat of a reaction to be measured and calculated, for example using Hess's law or enthalpies of formation. Its central quantity is the enthalpy change of reaction.

热化学是热力学中研究化学和物理过程中放出或吸收热量的分支。它使反应热得以测量和计算,例如借助赫斯定律或生成焓。其核心量是反应的焓变。