Abstract
By means of a new type of microbalance working in conjunction with a multiple-point manometer, an accurate comparison of the balancing pressures at the same density of oxygen and benzene vapour has been made at 22° C and in the region of from 19 to 69 mm. of benzene pressure. Four samples of highly purified benzene from different sources all gave for the molecular weight of the vapour the same result, which was very close to the theoretical value calculated from International Atomic Weights. It is claimed that the method is of general applicability, and that it is now possible to obtain for vapours at low pressures compressibilities and densities of high accuracy.
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