Gay-Lussac's Law Calculator
Enter the initial pressure and temperatures to get the final pressure.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
Gay-Lussac's Law states that for a fixed amount of gas held at constant volume, pressure is directly proportional to absolute temperature: P₁/T₁ = P₂/T₂, with temperatures in Kelvin — as a sealed gas heats up, its molecules strike the container walls harder and more often, raising pressure in direct proportion.
It's one of the components of the ideal gas law and explains everyday and industrial phenomena like why a sealed aerosol can or a car tire's pressure rises on a hot day, and why pressure vessels, autoclaves and gas cylinders need a rated temperature range — chemistry students and engineers use this relationship to predict a gas's final pressure after a temperature change without any volume change.
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