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# What Is The Formula For Boyle's Law?

Question: What Is The Formula For Boyle's Law?
Boyle's Law is a special case of the ideal gas law. This law only applies to ideal gases held at a constant temperature allowing only the volume and pressure to change.
Answer: Boyle's Law is expressed as:

PiVi = PfVf

where
Pi = initial pressure
Vi = initial volume
Pf = final pressure
Vf = final volume

It is important to remember the units for initial and final conditions are the same. Do not start with pounds and cubic inches for initial pressure and volume units and expect to find Pascals and liters without converting the units first.

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Anne Marie Helmenstine, Ph.D.