When to use atm v. bar units  [ENDORSED]

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Sydney Wu 2M
Posts: 50
Joined: Fri Jul 22, 2016 3:00 am

When to use atm v. bar units

Postby Sydney Wu 2M » Mon Nov 28, 2016 7:09 pm

Should we always use atm (unless specified in the question to use bar)? For instance, Q8 on p. 43 of the quiz workbook asks us to calculate the equilibrium partial pressures but does not specify which units to use. Q10 on the following page requires you to convert from molar concentration to partial pressures but again does not specify units.

vsyacoubian2A
Posts: 63
Joined: Fri Jul 22, 2016 3:00 am

Re: When to use atm v. bar units

Postby vsyacoubian2A » Mon Nov 28, 2016 7:14 pm

I think that you can use either bar or atm. I would use atm since the problems we have encountered thus far use atm for solutions.

Aileen Nguyen 3N
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Re: When to use atm v. bar units

Postby Aileen Nguyen 3N » Mon Nov 28, 2016 7:34 pm

It would specify if the problem wanted the solution to be in bars

Sydney Wu 2M
Posts: 50
Joined: Fri Jul 22, 2016 3:00 am

Re: When to use atm v. bar units

Postby Sydney Wu 2M » Mon Nov 28, 2016 7:36 pm

Ok, thanks!

Chem_Mod
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Re: When to use atm v. bar units  [ENDORSED]

Postby Chem_Mod » Mon Nov 28, 2016 9:44 pm

1 atm = 1.01 bar

We accept both atm and bar in Chem 14A and 14B since they are so similar, but 1 bar is the standard reference for pressure.
The difference between atm and bar is about 1%.


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