The law which gives the relationship between pressure and volume is called

Gay-Lussac's Law states that the pressure of a sample of gas at constant volume, is directly proportional to its temperature in Kelvin. According to Gay-Lussac's Law: P₁ / T₁ = constant After the change in pressure and temperature, P₂ / T₂ = constant Combine the two equations: P₁ / T₁ = P₂ / T₂ When any three of the four quantities in the equation are known, the fourth can be calculated. For example, we've known P₁, T₁ and P₂, the T₂ can be: T₂ = P₂ x T₁ / P₁