Charles's Law
| Formula / Notation | V₁/T₁ = V₂/T₂ (at constant P and n); V/T = k |
|---|---|
| Also Known As | Volume-temperature law, Gay-Lussac-Charles law, isobaric gas law |
What is Charles's Law?
Charles's Law states that at constant pressure, the volume of a fixed amount of ideal gas is directly proportional to its absolute temperature (V ∝ T, or V/T = constant). First published by Jacques Charles in 1787, it describes the thermal expansion of gases. Combined with Boyle's Law, it forms part of the ideal gas law (PV = nRT).
Formula & Notation
Other Names / Synonyms: Volume-temperature law, Gay-Lussac-Charles law, isobaric 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
Charles's Law states that at constant pressure, the volume of a fixed amount of ideal gas is directly proportional to its absolute temperature (V ∝ T, or V/T = constant). First published by Jacques Charles in 1787, it describes the thermal expansion of gases. Combined with Boyle's Law, it forms part of the ideal gas law (PV = nRT).
Charles's law explains the behaviour of hot air balloons, explains why tyre pressure and volume change with temperature, and is used in engineering calculations for gas-handling equipment. Combined with Boyle's law and Avogadro's principle, it leads to the ideal gas law PV = nRT.
Gases in sealed containers (aerosol cans, compressed gas cylinders) experience pressure increases when heated — a fire and explosion hazard described by the combined gas law. Never heat closed containers. Store compressed gases away from heat sources.
The formula or notation for Charles's Law is: V₁/T₁ = V₂/T₂ (at constant P and n); V/T = k