🌡️ Gay-Lussac’s Law Calculator
Calculate how a gas’s pressure changes with temperature at constant volume, using Gay-Lussac’s Law.
kPa
°C
°C
What Is Gay-Lussac’s Law?
Gay-Lussac’s Law states that for a fixed amount of gas at constant volume, pressure is directly proportional to absolute temperature. It explains why, for example, a sealed container’s pressure rises when heated.
The Formula
P1/T1 = P2/T2, so P2 = P1 × (T2/T1), where temperatures must be in an absolute scale (Kelvin). This calculator converts your Celsius inputs to Kelvin automatically.
For general educational purposes; assumes ideal gas behavior and truly constant volume and gas quantity.
Last reviewed August 2026