Qv vs Qp

isochoric/isometric:
isothermal:
isobaric:

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Brandon Valafar
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Qv vs Qp

Postby Brandon Valafar » Thu Jan 30, 2020 11:44 am

What is the difference between qv and qp?

rachelle1K
Posts: 109
Joined: Sat Sep 07, 2019 12:16 am

Re: Qv vs Qp

Postby rachelle1K » Thu Jan 30, 2020 12:00 pm

qv implies constant volume, whereas qp is constant pressure.

Sidharth D 1E
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Re: Qv vs Qp

Postby Sidharth D 1E » Thu Jan 30, 2020 12:37 pm

Both of these are used to find enthalpy/delta H but also find change in internal energy which is q + w. Therefore, q can either be qp or qv depending on the given conditions.

805303639
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Re: Qv vs Qp

Postby 805303639 » Thu Jan 30, 2020 12:54 pm

Sidharth D 1E wrote:Both of these are used to find enthalpy/delta H but also find change in internal energy which is q + w. Therefore, q can either be qp or qv depending on the given conditions.


Enthalpy/delta H is equal to qp, the amount of heat released or absorbed at a constant pressure. Using qv implies that the change in the internal energy (U) equals qv. The work term w drops out of U = q + w under conditions of constant volume.

205405339
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Re: Qv vs Qp

Postby 205405339 » Thu Jan 30, 2020 1:35 pm

q at constant volume and q at constant pressure

CameronDis2K
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Joined: Wed Feb 20, 2019 12:18 am

Re: Qv vs Qp

Postby CameronDis2K » Thu Jan 30, 2020 5:06 pm

Both represent heat energy of deltaH, but one is used when the volume is constant and the pressure changes (Qv) and the other is when the pressure is constant but the volume is changing (Qp).

Kallista McCarty 1C
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Re: Qv vs Qp

Postby Kallista McCarty 1C » Thu Jan 30, 2020 5:13 pm

qv is constant volume and qp is constant pressure

Diana Andrade_4F
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Joined: Tue Nov 05, 2019 12:18 am

Re: Qv vs Qp

Postby Diana Andrade_4F » Thu Jan 30, 2020 8:42 pm

Qv is when there's constant volume while Qp is constant pressure


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