Charles law states that the volume of a given mass of gas is directly proportional to its temperature in kelvin, provided that pressure remains constant.
Boyle's law state that "the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies if the temperature and amount of gas remain unchanged within a closed system".
   Mathematically:   P α 1/V
              OR          PV=K
Where P= pressure of the gas,V=Volume of the gas and K is a constant.
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