How to use this calculator
- Select P1, P2, V1, or V2 as the unknown.
- Enter the other pressure and volume values.
- Select the pressure and volume units and calculate.
Formula and variables
P1V1 = P2V2
| Symbol | Meaning | Unit |
|---|---|---|
| P1, P2 | initial/final pressure | compatible pressure |
| V1, V2 | initial/final volume | compatible volume |
Worked example
A gas at 1 atm and 2 L compressed to 2 atm has a final volume of 1 L.
Interpretation
Pressure and volume vary inversely at fixed temperature and amount.
Common mistakes
- Keep pressure units compatible.
- This relation assumes constant temperature and gas amount.
Frequently asked questions
What stays constant in Boyle's law?
Temperature and amount of gas stay constant.
How are pressure and volume related?
They are inversely proportional. A higher pressure gives a lower volume under the model assumptions.
Can the calculator solve for initial pressure?
Yes. It can solve for any one of P1, P2, V1, or V2.
Can I use scientific notation?
Yes. Enter values such as 6.022e23 or 1.0e-6 in a numeric field.
How should I round the result?
Keep extra digits during the calculation. Round the final result to the precision required by your data.