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Engineering ToolBox > Boyle's Law
Boyle's law states that in a perfect gas where mass and temperature is kept constant, the volume of the gas will vary inversely with the absolute pressure.
Boyle's law can be expressed as
PV = constant (1)
or
P1V1 = P2V2 (1b)
where
P = absolute pressure (Pa, psi...)
V = volume (m3, ft3...)
A gas with volume 1 m3 at 2 MPa is compressed to a final volume of 0.5 m3. If the temperature is kept constant the final pressure can be calculated as:
P2 = P1V1 / V2
= 2 MPa 1 m3 / 0.5 m3
= 4 MPa