In the classroom teaching of heat of combustion, we should first introduce combustion reaction and then lead to basic concept about it and about standard combustion reaction.
在燃烧热的课堂教学中，先介绍燃烧反应，再引出燃烧热、标准燃烧热的概念。
Secondly, the enthalpy of elementary substance under standard state is defined as the criterion of component enthalpy, thus reaction heat is no longer needed in energy balance.
其次，热量衡算时，将标准状态下单质的焓定义为所有组分的基准焓，不再需要反应热数据。
Secondly, the enthalpy of elementary substance under standard state is defined as the criterion of component enthalpy, thus reaction heat is no longer needed in energy balance.
其次，热量衡算时，将标准状态下单质的焓定义为所有组分的基准焓，不再需要反应热数据。
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