# Question #63929

Apr 6, 2014

Gas pressure can be increased either by raising the temperature or by decreasing the volume (if the container is flexible).

Most gases obey the ideal gas law to at least a good approximation:

$P = \frac{n R T}{V}$

where n is the number of moles of gas, R is the universal gas constant, T is the temperature in Kelvins, and V is the volume of the container.

If V is in liters, then using R=0.082054 L-atm/(mol-K) gives P in atm.
If V is in cubic meters, then R=8.314 J/(mol-K) gives P in Pa (pascals).