File:Carnot_heat_engine_2.svg · Wikimedia Commons · See Wikimedia Commons
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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- Subclass of
- energy
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- topic's main category
- Category:Enthalpy
- Commons category
- Enthalpy
- different from
- entropy
- studied by
- thermodynamics
- maintained by WikiProject
- WikiProject Mathematics
- invariant under
- isenthalpic process
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- Wikipedia:Vital articles/Level/4
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Article · 日本語
エンタルピー（英: enthalpy）とは、熱力学における示量性状態量のひとつである。熱含量（ねつがんりょう、英: heat content）とも。エンタルピーはエネルギーの次元をもち、物質の発熱・吸熱挙動にかかわる状態量である。等圧条件下にある系が発熱して外部に熱を出すとエンタルピーが下がり、吸熱して外部より熱を受け取るとエンタルピーが上がる。 名称はカメルリング・オネスによる。
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