## Constant Pressure

$w=-P\Delta V$
and
$w=-\int_{V_{1}}^{V_{2}}PdV=-nRTln\frac{V_{2}}{V_{1}}$

504939134
Posts: 103
Joined: Wed Sep 18, 2019 12:21 am

### Constant Pressure

Under what circumstances should you assume there is a constant pressure?

Jonathan Gong 2H
Posts: 105
Joined: Sat Jul 20, 2019 12:16 am

### Re: Constant Pressure

Constant pressure can be assumed if a pressure is given and nothing in the problem says that it changes. It can also be assumed if the problem says that the reaction or system takes place at standard conditions, which would mean that they take place at 1 atm.

Sidharth D 1E
Posts: 98
Joined: Sat Aug 24, 2019 12:17 am

### Re: Constant Pressure

Also, constant pressure can be assumed if you are dealing with an open system.

Anish Natarajan 4G
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Joined: Thu Jul 25, 2019 12:16 am

### Re: Constant Pressure

If they use the term "isobaric" in the problem it means that the pressure is staying constant

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