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When to use atm v. bar units

Posted: Mon Nov 28, 2016 7:09 pm
by Sydney Wu 2M
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.

Re: When to use atm v. bar units

Posted: Mon Nov 28, 2016 7:14 pm
by vsyacoubian2A
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.

Re: When to use atm v. bar units

Posted: Mon Nov 28, 2016 7:34 pm
by Aileen Nguyen 3N
It would specify if the problem wanted the solution to be in bars

Re: When to use atm v. bar units

Posted: Mon Nov 28, 2016 7:36 pm
by Sydney Wu 2M
Ok, thanks!

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

Posted: Mon Nov 28, 2016 9:44 pm
by Chem_Mod
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%.