Gay-Lussac's Law Calculator
💨 Gas Laws & Fluids. Use the Gay-Lussac's law formula to find pressure 1, temperature 1, pressure 2, temperature 2: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Pressure 1 | kPa |
| Temperature 1 | K |
| Pressure 2 | kPa |
| Temperature 2 | K |
Worked example
Find the pressure 1 when Temperature 1 = 300 K, Pressure 2 = 120 kPa, Temperature 2 = 360 K.
Using P1/T1 = P2/T2: Pressure 1 = 100 kPa.
Frequently asked questions
What is the formula for Gay-Lussac's law?
P1/T1 = P2/T2.
What do the letters stand for, and what units are used?
Pressure 1 in kPa, Temperature 1 in K, Pressure 2 in kPa, Temperature 2 in K.
How do you calculate pressure 1?
Put the values into P1/T1 = P2/T2. For example, with Temperature 1 = 300 K, Pressure 2 = 120 kPa, Temperature 2 = 360 K, pressure 1 = 100 kPa.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (pressure 1, temperature 1, pressure 2, temperature 2) and fill in the others: it rearranges the formula for you.
