Gay-Lussac's Law
| Formula / Notation | P/T = k (constant V, n); P₁/T₁ = P₂/T₂ |
|---|---|
| Also Known As | Pressure-temperature law, Amontons' law, isochoric (constant volume) gas law |
What is Gay-Lussac's Law?
The law stating that the pressure of a fixed amount of gas at constant volume is directly proportional to its absolute temperature (P ∝ T). Also refers to the law of combining volumes: gases react in simple whole-number ratios by volume at the same temperature and pressure.
Formula & Notation
Other Names / Synonyms: Pressure-temperature law, Amontons' law, isochoric (constant volume) gas law
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The law stating that the pressure of a fixed amount of gas at constant volume is directly proportional to its absolute temperature (P ∝ T). Also refers to the law of combining volumes: gases react in simple whole-number ratios by volume at the same temperature and pressure.
Gay-Lussac's law explains why pressure in a sealed, rigid container (autoclave, pressure cooker, gas cylinder) rises when heated. It is used to calculate the pressure increase in sealed gas storage vessels when temperature rises, and in the design of pressure relief valves for safety.
The direct proportionality of pressure and temperature means that gas cylinders stored in hot environments (car boots, direct sunlight) experience pressure increases that can exceed valve safety limits and cause rupture or explosion. Always store gas cylinders at
The formula or notation for Gay-Lussac's Law is: P/T = k (constant V, n); P₁/T₁ = P₂/T₂