Gay-Lussac's Law Calculator
Find the final pressure when the temperature of a fixed amount of gas changes at constant volume. Enter temperatures in Kelvin and use absolute pressure values.
Gay-Lussac's law
Find final pressure at constant volume.
Enter positive values. Temperatures must be in Kelvin and pressures must be absolute, not gauge pressure.
Your answer will appear here
Enter your known values and select Calculate to see the result, formula, and solution steps.
How Gay-Lussac's law works
Gay-Lussac's law relates pressure to absolute temperature when volume and the amount of gas remain constant. It helps explain how heating a sealed, rigid container affects gas pressure.
P₁ / T₁ = P₂ / T₂
Assumptions and conditions
- The gas volume remains constant.
- The amount of gas remains constant.
- Temperatures must be in Kelvin.
- Pressure values must be absolute pressure.
Frequently asked questions
What does Gay-Lussac's law calculate?
It relates the pressure and absolute temperature of a fixed amount of gas at constant volume.
What happens to pressure when temperature rises?
At constant volume, increasing absolute temperature increases gas pressure proportionally.
Can I enter Celsius directly?
No. Convert Celsius to Kelvin by adding 273.15 before entering the temperature.
What is the formula for Gay-Lussac's law?
The formula is P₁/T₁ = P₂/T₂. Rearranging it gives P₂ = P₁T₂/T₁.
How to use this calculator
- Enter the initial absolute pressure.
- Enter the initial temperature in Kelvin.
- Enter the final temperature in Kelvin.
- Select Calculate result to calculate the final pressure.
Gay-Lussac's law formula
The equation P₁/T₁ = P₂/T₂ describes the relationship between absolute pressure and absolute temperature at constant volume. Rearranging it gives P₂ = P₁T₂/T₁.