If the temperature of a gas is constant and you multiply its pressure by volume, it will always equal a constant. This is known as Boyle's Law.

Boyle's Law states that the volume of a given mass of an ideal gas is inversely proportional to its pressure when the temperature is held constant. This can be expressed mathematically as:

P₁V₁ = P₂V₂

Where:

* P₁ = Initial pressure

* V₁ = Initial volume

* P₂ = Final pressure

* V₂ = Final volume

Therefore, the product of pressure and volume (P*V) remains constant as long as the temperature stays the same.