PV = nRT: Understanding Pressure Units in Gas Laws

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In summary, when using the ideal gas law PV = nRT, the units for pressure and volume must match the units of the gas constant (R). If R is in units of m3·Pa·K-1·mol-1, then pressure must be in Pa and volume must be in m^3. If R is in units of L·atm·K-1·mol-1, then pressure must be in atm and volume must be in L. It is important to check the units of R to ensure that the correct units are being used in the calculation.
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Quick Question...Test at 8 am!

When using PV = nRT does P have to be in atm? Or is it Pa?
 
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BuBbLeS01 said:
When using PV = nRT does P have to be in atm? Or is it Pa?

depends on the R you're using...

if you learned
R = 8.314472 m3·Pa·K-1·mol-1

then you need to use pressure in Pa. and volume needs to be in m^3. which R did you learn?

if you learned
R = 0.08205784 L·atm·K-1·mol-1

then you need to use pressure in atm. and volume needs to be in L.

have a look at the R using different units:

http://en.wikipedia.org/wiki/Ideal_gas_law
 
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oh ok thanks
 

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