Boyle's Law (Mariotte's Law)
A perfect gas and Boyle's law
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Boyle's law (Mariotte'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...)
Example - Boyle's Law
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
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