Boyle's Law states that the volume of a given mass of gas is inversely proportional to its pressure when the temperature is held constant. This means:

* As pressure increases, volume decreases.

* As pressure decreases, volume increases.

Mathematically, this is represented as:

P₁V₁ = P₂V₂

Where:

* P₁ = Initial pressure

* V₁ = Initial volume

* P₂ = Final pressure

* V₂ = Final volume