Measurement of mass, volume, and pressure

To determine the atomic weight of sulphur from density measurements on oxygen and on sulphur dioxide. 

A known mass of gas is compressed to a known volume so that its density g is known and its pressure p is then measured. The ratio L = qIP is calculated. The data in table 1 for 0X5 gen and sulphur dioxide were obtained at 0 C by Moles, Toral, and Escribano (Trans. Faraday Soc. 1939, 35, 1451). 

By assuming that L is linear in the pressure p, the value Lg corresponding to zero pressure is calculated. The molecular weights are directly proportional to Lg. 

By a similar procedure, but with fewer steps, we obtain for oxygen 

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