How it is calculated
The gas is ideal: the molecules have no volume of their own and do not interact. Temperature must be in kelvin. Zero Celsius is 273,15 K.
PV = nRT, R = 8,314 J/(mol·K)
Where the numbers come from
- Pressure — unit in the field: Pa
- Volume — unit in the field: m³
- Quantity — unit in the field: mol
- Temperature — unit in the field: K
Example
1 mol at 300 K in a volume of 1 m³ gives a pressure of 1 × 8,314 × 300 / 1 = 2494,2 Pa.
Questions
How do I leave a field empty?
Clear the number. Zero means a zero you typed in, and a positive result often cannot come out of it.
Liters and atmospheres?
Convert first: 1 L = 0,001 m³, 1 atm = 101325 Pa.
Air in the room?
For an estimate you can, if you take the temperature in kelvin and do not expect moist air to be exact.