Ideal Gas Law Calculator (PV = nRT)
Calculate pressure (P), volume (V), number of moles (n), or temperature (T) of an ideal gas using the ideal gas law PV=nRT. Chemistry and physics calculator for students studying thermodynamics, gas behavior, and kinetic molecular theory. Supports various unit combinations.
Ideal Gas Law
PV = nRTVariables:
- PPressure (Pa or atm)Pressure (Pa or atm)
- VVolume (Liters or m³)Volume (Liters or m³)
- nNumber of moles (mol)Number of moles (mol)
- RIdeal Gas Constant (0.0821 atm·L/mol·K or 8.314 J/mol·K)Ideal Gas Constant (0.0821 atm·L/mol·K or 8.314 J/mol·K)
- TAbsolute temperature (Kelvin)Absolute temperature (Kelvin)
How to Use
- 1
Select Target
Choose the variable you want to find (Pressure, Volume, Mol, or Temp).
- 2
Choose Units
Make sure units are consistent (SI or ATM).
- 3
Enter Data
Enter the known variable values.
- 4
Calculate
Get the calculation result.
Examples
Finding Gas Volume
Problem:
1 mol of gas at 0°C (273 K) and 1 atm.
Solution:
- 1.R = 0.0821
- 2.V = nRT / P
- 3.V = 1 * 0.0821 * 273 / 1
Result:22.4 liters
The molar volume of a gas at STP is 22.4 liters.
Frequently Asked Questions
What is STP?
Standard Temperature and Pressure (0°C, 1 atm).
When is a gas considered ideal?
At high temperature and low pressure, where intermolecular interactions can be ignored.