Internal Energy, U

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smurphy1D
Posts: 51
Joined: Mon Nov 18, 2019 12:18 am

Internal Energy, U

Postby smurphy1D » Sat Feb 01, 2020 9:29 am

Is Delta U always equal to Delta H?
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Sally Qiu 2E
Posts: 105
Joined: Fri Aug 30, 2019 12:18 am

Re: Internal Energy, U

Postby Sally Qiu 2E » Sat Feb 01, 2020 9:48 am

it's equal if you are at constant pressure and volume.
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Juliana Chopelas 1A
Posts: 50
Joined: Sat Aug 24, 2019 12:16 am

Re: Internal Energy, U

Postby Juliana Chopelas 1A » Sat Feb 01, 2020 11:12 am

delta u is only equal to delta h when pressure is constant and volume doesn't change
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CMaduno_1L
Posts: 102
Joined: Wed Sep 18, 2019 12:18 am

Re: Internal Energy, U

Postby CMaduno_1L » Sat Feb 01, 2020 1:35 pm

A counter example would be in an isolated system, where neither heat nor matter can be exchanged, dU = q + w.
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preyasikumar_2L
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

Re: Internal Energy, U

Postby preyasikumar_2L » Sat Feb 01, 2020 3:10 pm

ΔH = ΔU + PΔV

ΔU is only equal to ΔH when the pressure is constant and the change in volume ΔV = 0.
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Matthew Chan 1B
Posts: 111
Joined: Sat Sep 07, 2019 12:16 am

Re: Internal Energy, U

Postby Matthew Chan 1B » Sun Feb 02, 2020 3:38 pm

Only at constant pressure and volume! :)
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Jesse Anderson-Ramirez 3I
Posts: 54
Joined: Thu Sep 26, 2019 12:18 am

Re: Internal Energy, U

Postby Jesse Anderson-Ramirez 3I » Sun Feb 02, 2020 3:58 pm

Only when change in pressure and change in volume are zero.
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