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Gay-Lussac Pressure–Temperature Law Calculator — result sheet
Estimate a gas pressure after a temperature change at constant volume and fixed amount of gas.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: P₁/T₁ = P₂/T₂; P₂ = P₁(T₂/T₁), with T in kelvin.
The constant-volume gas relation uses absolute temperature, not Celsius differences, and returns the changed absolute pressure plus the pressure ratio.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Initial absolute pressure — kPa; minimum 1.0E-6; maximum 1000000000
- Initial temperature — °C; minimum -273.149; maximum 10000
- Final temperature — °C; minimum -273.149; maximum 10000
Worked example
| Input | Value |
|---|---|
| Initial absolute pressure | 101.325 |
| Initial temperature | 20 |
| Final temperature | 80 |
Final absolute pressure is about 122.06 kPa, or 1.205 times the initial pressure.
Assumptions and limits
- The amount of gas and volume stay constant, pressures are absolute, and temperatures are converted to kelvin.
- The gas is treated as sufficiently dilute for the ideal relation over the entered range; phase changes, leaks, expansion, and real-gas effects are not modeled.
- The output is a physical estimate, not a pressure-vessel or storage safety limit.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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