Practical tools for measured work
Ideal gas law calculator
Solve PV = nRT and compare compatible units of the universal gas constant.
Calculate the layout, check the diagram, then print the result for the shop or jobsite.
Universal gas constant in compatible units
| R | Units |
|---|---|
| 8.31446261815324 | J/(mol·K) = Pa·m³/(mol·K) |
| 8.31446261815324 | kPa·L/(mol·K) |
| 0.08205736608096 | L·atm/(mol·K) |
| 62.36359822153 | L·Torr/(mol·K) |
How it works
PV = nRT, using R = 8.31446261815324 J/(mol·K). Pressure must be absolute, not gauge pressure. Kelvin equals Celsius plus 273.15. One litre is 0.001 cubic metres.
Current-input example
The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.
- Quantity to calculate
- Gas volume
- Absolute pressure
- 101325 Pa
- Amount of gas
- 1 mol
- Absolute temperature
- 273.15 K
Primary result: Absolute pressure: 101325 Pa.
Before using the result
- Check the selected mode, units and input values before using the result.
- Read the assumptions and rounding rules; compare the worked example with your intended calculation.
- A numerical result does not supply missing context or change the stated limitations.
Limitations
All calculated and entered quantities must be positive. Ideal-gas behaviour is an approximation and can be inaccurate near condensation or at high pressures. The different R values must be paired with their stated pressure and volume units.
Frequently asked questions
What should I verify before using this result?
Check the input values, units, dates and assumptions. Compare the method and its stated limits with the source relevant to your task.
Why might the finished result differ?
Results depend on the entered data and the model’s assumptions. Rounding, changing conditions or omitted factors can affect the comparison. Read the limitations before using the result.
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