Gay-Lussac's Law Calculator

Gay-Lussac's Law describes how a gas's pressure rises with temperature when it's sealed in a fixed volume — think of a spray can warming up.

sealed container P1,T1 → P2,T2
Instant Result
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What Is a Gay-Lussac's Law Calculator?

Gay-Lussac's Law describes how a gas's pressure rises with temperature when it's sealed in a fixed volume — think of a spray can warming up. This calculator solves for any one of pressure/temperature pair values from the other three.

How to Use This Gay-Lussac's Law Calculator

  1. Fill in any three of the four fields: P1, T1, P2, T2 (temperatures must be in Kelvin).
  2. Leave the field you want to solve for blank.
  3. Click Calculate to find the missing value.

Formula

Worked Example

A sealed can at 1 atm and 290 K is heated to 350 K. Leaving P2 blank: P2 = (1×350)/290 ≈ 1.21 atm.

Frequently Asked Questions

What does Gay-Lussac's Law state?

At constant volume, the pressure of a gas is directly proportional to its absolute temperature: P1/T1 = P2/T2.

Why must temperature be in Kelvin for this calculation?

Like the other gas laws, this proportional relationship only holds using absolute (Kelvin) temperature, not Celsius or Fahrenheit.

What's a real-world example?

An aerosol can warming up and building internal pressure — if heated enough, the rising pressure (at essentially constant volume) can cause it to rupture.

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