# What is the ideal gas law constant?

##### 1 Answer

Dec 18, 2013

The units of Ideal gas law constant is derived from equation PV = nRT

Where the pressure - P, is in atmospheres (atm) the volume - V, is in liters (L) the moles -n, are in moles (m) and Temperature -T is in Kelvin (K) as in all gas law calculations.

When we do the algebraic reconfiguration we end up with Pressure and Volume being decided by moles and Temperature, giving us a combined unit of

atm x L / mol x K. the constant value then becomes 0.0821 atm(L)/mol(K)

If you choose not to have your students work in standard pressure unit factor, you may also use: 8.31 kPA(L)/mol(K) or 62.4 Torr(L)/mol(K).

Temperature must always be in Kelvin (K) to avoid using 0 C and getting no solution when students divide.

I hope this is helpful.