How this calculator works
At fixed volume and amount, ideal-gas pressure is proportional to absolute temperature. A sealed rigid vessel approximates these constraints. Use absolute pressure, not pressure relative to the atmosphere. The optional initial-state volume and amount modes use the exact SI molar gas constant.
Formula
p1/T1 = p2/T2; p1 V = nRT1.
Worked example
Heating a sealed gas from 300 K to 450 K raises pressure from 100000 Pa to 150000 Pa. Cooling 200000 Pa at 400 K to 300 K gives 150000 Pa.
Advertisement
Frequently asked questions
What stays constant?
Volume and amount of gas.
When does the ideal model lose accuracy?
Near condensation or at high density, intermolecular forces and finite molecular size become important.
Must the container be rigid?
Yes, for this two-state relation. If its volume changes, use the combined ideal gas relation instead.