Units for Pressure

[Riya Sood 4G]

What units for pressure do we use when calculating using the formula, pv=nRT? Is it bar or atm?

[Jordan Young 2J]

It doesn't matter which unit you use, but you have to make sure the R constant value/units corresponds with that pressure unit to make sure that units cancel.

[Natalie Benitez 1E]

What is the difference between the bar unit and the atm unit for pressure?

[Ruby Tang 2J]

They are both units of pressure, with 1 atm being approximately 1.01325 bar. As previously mentioned, you can use either unit as long as you ensure that the units cancel, but when dealing with the ideal gas law PV=nRT, we generally use atm instead of bar because we conventionally say that the gas constant R is equal to 0.08206 (L*atm)/(mol*K). Hope this helps!

[Qiu Ya Wu 4I]

In one of Lavelle's video lectures he asserted that we will treat 1 bar as equal to 1 atmosphere for the purposes of this course.

[preyasikumar_2L]

It doesn’t matter what units of pressure you use as long as you use the appropriate value of R that works with those units.

[Juana Abana 1G]

What is the difference between the bar unit and the atm unit for pressure?

Yes, I have the same question.