The law connecting the volume of a gas with the temperature was
discovered by Gay-Lussac, and independently by Dalton; but it is
gene rally attributed to the former chemist. It is : Provided
pressure be kept constant, the volume of a gas, measured at 0
degrees C., increases by 1/273 for each rise of 1 degree C.. Or
1 volume of gas at 0 degrees will become 1.00367 volume at 1;
1.0367 volume at 10 ; 1.367 volume at 100, and so on. Generally
stated, if / stand for a temperature, 1 volume of gas will
become 1 + O.OO367/ when heated from 0 degrees to that
temperature. A third law may be deduced from these two ; it is,
that if the volume of a gas be kept constant, the pressure of a
gas will increase 1^ of its initial value at for each rise of 1.
This is evident from the following consideration : Suppose that
i volume of a gas is heated from o to i; the volume will
increase to 1.00367 volume. To reduce the volume again to its
initial value, i, the pressure must be raised by 0.00367 of its
original amount. If the ini