PV=nRT
The Ideal Gas Law it relates the amount of a gas (in moles) to its pressure, volume and temperature. The Ideal Gas constant will vary depending on the units of pressure used, see below. Enter three known values to get the fourth. You may enter as many digits as you wish. Then select the desired units
All gasses contain the same number of molecules at the same pressure, temperature and volume. However, the mass will vary.