## internal energy

annikaying
Posts: 94
Joined: Sat Sep 14, 2019 12:16 am

### internal energy

How do constant pressure and temperature affect calculations for internal energy?

sbeall_1C
Posts: 109
Joined: Sat Sep 07, 2019 12:17 am
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### Re: internal energy

Constant temperature (isothermal) indicates that delta U is 0. Constant pressure allows you to set q equal to delta H, and the work is -PdeltaV.

KaleenaJezycki_1I
Posts: 127
Joined: Sat Aug 17, 2019 12:18 am
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### Re: internal energy

sbeall_1C wrote:Constant temperature (isothermal) indicates that delta U is 0. Constant pressure allows you to set q equal to delta H, and the work is -PdeltaV.

And internal energy=0 when the process is isothermal because internal energy is heat transfer. So if the temperature is not changing then there will be no change in internal energy and this is where we derive the equation q=-w

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