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What is Charl's law
Charles's law states that:
         The volume of a given mass of an ideal gas is directly proportional to its temperature on the absolute temperature scale (in Kelvin) if pressure and the amount of gas remain constant; that is, the volume of the gas increases or decreases by the same factor as its temperature.
This directly proportional relationship can be written as             
                                 V \propto T\,

                                    or

                          \frac{V}{T}=k

where:

    V is the volume of the gas
    T is the temperature of the gas (measured in Kelvin).
    k is a constant.


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