Enthalpy vs. Internal Energy

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Mayvera Doaran 2H
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Joined: Fri Sep 25, 2015 3:00 am

Enthalpy vs. Internal Energy

Postby Mayvera Doaran 2H » Tue Jan 19, 2016 11:37 pm

What's the difference between enthalpy, delta H, and internal energy, delta U? When does enthalpy equal internal energy?

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Re: Enthalpy vs. Internal Energy

Postby Chem_Mod » Wed Jan 20, 2016 12:47 am

The difference is work that can be done. Enthalpy H is defined by H=U+PV which essentially eliminates the work which as you know is -PV. Enthalpy can only equal internal energy when both are exactly 0 in an isothermal process.

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