Boyle's Law of gases

The volume of a dry gas varies inversely with the pressure exerted upon it, provided the temperature is constant.

If you double the pressure you will cut the volume in half.

When two quantities are in inverse proportion, their product is a constant so:

  • p1 = the new pressure
  • V1 = the new volume

This is the explanation of why air ingestion into a pump can cause a cavitation problem but not as severe a problem as a fluid vaporizing.

When 100°C (212°F) water vaporizes it increases in volume 1500 to 1600 times, but if air has leaked into the system, and you cut the pressure in half, the air will only double in volume according to Boyle's law.



  • On February 14, 2018