Boyle's Law

Boyle's Law states the volume of a definite quantity of dry gas is inversely proportional to the pressure, provided the temperature remains constant.

Mathematically Boyle's law can be expressed as:
P1V1 = P2V2

boyle's law expressed mathematically
  • V1 is the original volume
  • V2 is the new volume
  • P1 is original pressure
  • P2 is the new pressure

Suppose you have a gas with 45.0 ml of volume and has a pressure of 760.mm. If the pressure is increased to 800mm and the temperature remains constant then according to Boyle's Law the new volume is 42.8 ml.

(760mm)(45.0ml) = (800mm)(V2)
V2=42.8ml