Complete the following statement: (In Boyle's law), the volume of a gas when the decreases.

In Boyle's law the volume of a gas increases when the pressure decreases.

Explanation:

Boyle's law states that at fixed mass of gas, the volume of a gas is inversely proportional to the gas pressure, provided temperature remain constant.

Mathematically it be expressed as;

P₁V₁ = P₂V₂

As the  volume of a gas increases,  the pressure decreases, or as the volume of the gas decreases, the pressure of the gas increases.

Therefore, in Boyle's law the volume of a gas increases when the pressure decreases.