File:Carnot_heat_engine_2.svg · Wikimedia Commons · See Wikimedia Commons
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Enthalpy is a measurement that combines a system's internal energy with the energy needed to make room for it at a given pressure and volume. Scientists use enthalpy to track energy changes in chemical, biological, and physical systems, especially when they occur at the constant atmospheric pressure of Earth's surface.
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Key facts
- Physical quantity.name
- Enthalpy
- Physical quantity.unit
- joule
- Physical quantity.symbols
- H
- Physical quantity.baseunits
- kg⋅m2⋅s−2
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Article · 中文
焓（hán）（英語：Enthalpy）是一个热力学系统中的能量参数。规定由字母表示（来自于英语Heat Capacity（热容）一词），单位為焦耳（J）。此外在化学和技术文献中，摩尔焓（单位：千焦/摩尔，kJ/mol）和质量焓（或比焓）（单位：千焦/千克，kJ/kg）也非常重要，它们分别描述了焓在单位物质的量和单位质量上的定义。 焓是内能和体积的勒让德变换。它是S,P,N 总合的热势能。
Abstract from DBpedia / Wikipedia · CC BY-SA