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Charles's Law

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Charles's law states:  If the pressure is constant, the volume of a mass of gas is proportional to the absolute temperature. The absolute temperature is always 273 Kelvin more than the centigrade temperature.

A useful expression of this physics law is:

Charles's Law Equation Where V1 is the volume of a mass of gas at temperature T1 kelvins and V2 is its volume after the temperature has changed to T2 kelvins.

 

Charles's Law Illustration

Another illustration that is helpful to understand Charles's law is when you have the same amount of molecules in two separate volumes, yet they have displace different volumes caused by 2 different temperatures.
This graph plots the formula and will show either the volume or the temperature as they change. Charles's Law Graph