About Ideal Gas Calculator
The ideal gas law relates the pressure, volume, amount, and temperature of a gas: PV = nRT. This calculator rearranges it for the unknown, for example P = nRT ÷ V, using R = 8.314462618 L·kPa/(mol·K) with pressure in kPa, volume in liters, amount in moles, and temperature in kelvin. It assumes ideal behaviour, which is a good approximation at low pressure and moderate temperature but not near condensation.
How to use Ideal Gas Calculator
- Fill in "Solve for", "Pressure", "Volume" and "Amount of gas", and the other options.
- The result appears below and updates as you type.
- Copy the result with the copy button, or download it as a file where that is offered.
Questions about Ideal Gas Calculator
Why must temperature be in kelvin?
The gas law needs an absolute temperature scale, where zero means no thermal motion. Add 273.15 to a Celsius temperature to get kelvin, so 25 °C is 298.15 K.
What is the volume of one mole of gas at standard conditions?
At 0 °C (273.15 K) and 1 atm (101.325 kPa), one mole of an ideal gas occupies 22.414 liters. These are the default values in the calculator.
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