The gas law that relates pressure, volume, and temperature is the Combined Gas Law.

Here's the equation:

P₁V₁/T₁ = P₂V₂/T₂

Where:

* P₁ = Initial pressure

* V₁ = Initial volume

* T₁ = Initial temperature (in Kelvin)

* P₂ = Final pressure

* V₂ = Final volume

* T₂ = Final temperature (in Kelvin)

Important Notes:

* Temperature must be in Kelvin: The Combined Gas Law requires temperature to be expressed in Kelvin.

* Direct and Inverse Relationships: The Combined Gas Law shows that pressure and volume are inversely proportional (if one increases, the other decreases), and that pressure and temperature are directly proportional (if one increases, the other increases).

Let me know if you'd like examples or more explanations!