PV = nRT — Ideal Gas Law
P₁V₁ = P₂V₂ — Boyle's Law
V₁/T₁ = V₂/T₂ — Charles's Law
P₁/T₁ = P₂/T₂ — Gay-Lussac's Law
(P₁V₁)/T₁ = (P₂V₂)/T₂ — Combined Gas Law