How to Calculate Gas Pressure & Temperature (P1/T1 = P2/T2)
Calculate rigid vessel pressure shifts step-by-step:
Enter Initial P1 & T1
Input starting pressure P1 and initial temperature T1.
Convert to Kelvin
System converts temperature inputs to absolute Kelvin.
Enter Final T2
Input heated or cooled final temperature T2.
Compute Final P2
Multiply P2 = P1 × (T2 / T1) for new pressure.
Key Features & Isochoric Thermodynamics
Isochoric Rigid Container Engine
Computes pressure build-up inside fixed-volume tanks and tires.
Flexible Units Support
Supports PSI, atm, bar, and kPa pressure calculations.
Automotive Tire Safety
Explains seasonal tire pressure drops in winter and overheating in summer.
Physical Chemistry Guide: Gay-Lussac's Law
Gay-Lussac's Law (Joseph Louis Gay-Lussac, 1808) states that at constant volume, the pressure of a fixed mass of gas is directly proportional to its absolute temperature:P_1 / T_1 = P_2 / T_2 ⇒ P_2 = P_1 · (T_2 / T_1)
Frequently Asked Questions
?Why does car tire pressure drop in cold winter weather?
Because tire volume is roughly constant, lowering ambient temperature reduces air molecule kinetic velocity, causing pressure to drop by ~1 PSI for every 10°F drop in temperature.