Lei de Gay-Lussac
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
Gay-L
About this calculator
The Gay-Lussac Calculator is a useful tool to help calculate the relationship between pressures and temperatures at different points of a thermodynamic process. It's based on the formula P₁/T₁ = P₂/T₂, which relates the initial pressure (P₁) and initial temperature (T₁) to the final pressure (P₂) and final temperature (T₂).
This law is particularly useful in cases where it's necessary to calculate the pressure of a gas at different temperatures, such as in compression, expansion or heating processes. With this calculator, you can quickly find the relationship between pressures and temperatures at different conditions.
However, it's essential to be careful with the unit of measurement used for pressure and temperature. The Gay-Lussac Calculator works with SI units (pascals for pressure and kelvins for temperature). Make sure to convert the units of measurement before making the calculation.
In addition, it's worth noting that the Gay-Lussac Law is an approximation and not valid in all cases. For example, in processes involving phase changes, such as the vaporization of a liquid, the law is not applicable.
Frequently asked questions
What is the Gay-Lussac Law?
The Gay-Lussac Law is a thermodynamic law that relates the pressure and temperature of a gas in different conditions. It is expressed by the formula P₁/T₁ = P₂/T₂.
When to use the Gay-Lussac Calculator?
Use the Gay-Lussac Calculator in cases where it's necessary to calculate the pressure of a gas at different temperatures, such as in compression, expansion or heating processes.
What unit of measurement does the calculator use?
The Gay-Lussac Calculator works with SI units (pascals for pressure and kelvins for temperature). Make sure to convert the units of measurement before making the calculation.
Can I use the calculator in processes that involve phase changes?
No, the Gay-Lussac Law is not valid in processes that involve phase changes, such as the vaporization of a liquid.
How can I ensure that the calculator is providing accurate results?
Make sure to use correct units of measurement and follow the correct formula (P₁/T₁ = P₂/T₂). Additionally, verify if the application of the law is valid for the specific problem.