Internal energy change, isothermal expansion

isochoric/isometric:
isothermal:
isobaric:

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805303639
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Internal energy change, isothermal expansion

Postby 805303639 » Thu Jan 30, 2020 1:03 pm

I'm confused about why the change in internal energy for the isothermal expansion of a gas is 0. I understand that the kinetic energy of the system isn't changing due to the constant temperature. But wouldn't the potential energy of the gas decrease because of reduced intermolecular interactions/repulsions?

AKhanna_3H
Posts: 104
Joined: Wed Sep 18, 2019 12:19 am

Re: Internal energy change, isothermal expansion

Postby AKhanna_3H » Thu Jan 30, 2020 1:15 pm

I believe it is because we are assuming an ideal gas, in which there are no intermolecular forces, so we only consider kinetic energy.


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