Ideal Gas Law Solver

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In this Demonstration, you can solve for any of the four variables in the ideal gas law, , given the other three. In SI units the pressure is expressed in pascals (Pa), equal to . Since one standard atmosphere equals 101.325 kPa, the SI pressure units are given in kPa. Volume is in , temperature in K, and number of moles in mol. The universal gas constant J/K mol (it is divided by 1000 so comes out in kPa).


In the older, but still extensively used liter-atmosphere system of units, is given in atm and in L, and the gas constant is L atm/K mol. The temperature on the Celsius scale (°C) is also shown.

At low temperatures or high pressures, the ideal gas law becomes inaccurate and you must use another equation of state, such as the van der Waals equation.


Contributed by: S. M. Blinder (March 2011)
Open content licensed under CC BY-NC-SA



Snapshot 1: traditional definition of standard state: 1 atm, 0°C; gives well-known molar volume, 22.4 L

Snapshot 2: an alternative new definition, with kPa = 1 bar

Snapshot 3: closer to room temperature, °C

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