qv vs qp

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vicenteruelos3
Posts: 42
Joined: Fri Sep 29, 2017 7:07 am

qv vs qp

Postby vicenteruelos3 » Fri Jan 12, 2018 2:18 pm

What is the difference between qv and qp?

sahajgill
Posts: 20
Joined: Fri Sep 29, 2017 7:06 am

Re: qv vs qp

Postby sahajgill » Fri Jan 12, 2018 2:19 pm

Qp is constant pressure while Qv is constant volume

Rachel Formaker 1E
Posts: 86
Joined: Fri Sep 29, 2017 7:04 am
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Re: qv vs qp

Postby Rachel Formaker 1E » Fri Jan 12, 2018 2:24 pm

Dr. Lavelle also specified that Qv is found using a bomb calorimeter, which keeps volume constant, while Qp is found using a coffee cup calorimeter, which allows gases to escape to keep pressure constant.

Elizabeth Bamishaye 2I
Posts: 54
Joined: Fri Sep 29, 2017 7:04 am

Re: qv vs qp

Postby Elizabeth Bamishaye 2I » Fri Jan 12, 2018 2:28 pm

Also to add on the previous answers: qv is the heat absorbed or released at constant volume and uses bomb calorimetry; while qp is the heat absorbed or released at constant pressure and gives enthalpy values.

aaron tang 2K
Posts: 49
Joined: Thu Jul 27, 2017 3:01 am

Re: qv vs qp

Postby aaron tang 2K » Sun Jan 14, 2018 5:34 pm

Qv is constant volume, Qp is constant pressure. Lavelle used Qv in the example of the bomb calorimeter and Qp in the coffee cup calorimeter.
Qv: heat absorbed or released at constant volume. Qp: heat absorbed or released at constant pressure and gives enthalpy values.


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