Boyle's Law Calculator

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Both pressures share this unit. The math cancels units as long as the pair matches.
Both volumes share this unit.
Pressure of the gas before the change. Leave blank to solve for it.
kPa
Volume of the gas before the change. Leave blank to solve for it.
L
Pressure of the gas after the change. Leave blank to solve for it.
kPa
Volume of the gas after the change. Leave blank to solve for it.
L
Solved value
1
Unknown solvedFinal volume (V2)
Constant P x V200
Volume change-50%
Pressure change100%
Pressure change100%
Volume change-50%

Final volume (V2) = 1 L.

  • Boyle's law fixes the product P x V, so the whole calculation is just rearranging P1V1 = P2V2.
  • Volume and pressure move in opposite directions: lowering the pressure lets the same gas expand to a larger volume.
  • This holds only while temperature and the amount of gas stay constant; heating the gas breaks the simple inverse rule.

Next stepIf the temperature also changes, switch to the combined gas law (P1V1/T1 = P2V2/T2) to keep the bookkeeping correct.

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