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Gay-Lussac's law

Gay-Lussac's law of combining volume
On a hot summer day pressure in well inflated tyres of automobiles increases considerably and the tyre may burst if pressure is not adjusted properly. On a cold morning during winters, one may find the pressure in the tyres of a vehicle decreased considerably. The mathematical relationship between pressure and temperature was given by Joseph Gay Lussac and is known as Gay-Lussac's law.
Gay-Lussac's law states that at constant volume, pressure of a fixed amount of a gas varies directly with the temperature. Mathematically, 
p T
= constant
This relationship can be derived from Boyle's law and Charle's law.

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