# What does the R stand for in the ideal gas law (PV=nRT)?

##### 1 Answer

May 25, 2014

The units of the **universal gas constant** **Regnault**.

If

- the pressure
#P# is in atmospheres (atm), - the volume
#V# is in liters (L), - the moles
#n# is in moles (mol), - and temperature
#T# is in Kelvin (K),

then

In other scenarios with pressures of

There is a variation of the ideal gas law that uses the density of the gas with the equation

#PM = DRT# where

#M# is the molar mass in#"g/mol"# and#D# is the density of the gas in#"g/L"# .

Lastly, this video may help introduce you to the ideal gas law.

I hope this is helpful.