text: Boyle's law states that:
  The concept can be represented with these formulae:
  *, meaning "Volume is inversely proportional to Pressure", or
  *,  meaning "Pressure is inversely proportional to Volume", or
  *, or
  where  is the pressure,  is the volume of a gas, and  is the constant in this equation (and is not the same as the proportionality constants in the other equations).