Enthalpy
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Watch this video, which goes into more detail about the difference between internal energy (U) and enthalpy (H). The presenter uses a pressure-volume graph to show why internal energy is defined at constant volume and enthalpy is defined at constant pressure.
Source: Khan Academy, https://youtu.be/OwTEYN5ZK0A
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Last modified: Thursday, 20 May 2021, 2:33 PM