IX. On the compressibility of gases between one atmosphere and half an atmosphere of pressure

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Abstract
The present is the third of a series of memoirs in which are detailed observations upon the compressibility of the principal gases at pressures from one atmosphere downwards. In the first of these the pressures dealt with were exceedingly low, ranging from 1·5 millims. to 0·01 millim. of mercury, and the use of a special and extraordinarily delicate manometer allowed the verification of Boyle’s law to be pushed to about 1/2000 of a millimetre of mercury. In the second memoir the products of pressure and volume at constant temperature (that of the room) were compared when the pressure was changed from 75 millims. to 150 millims. of mercury—in the ratio of 2:1. The ratio of the products (denoted by B) would be unity according to Boyle’s law; for the more condensable gases, e. g. , nitrous oxide, it exceeds unity. The following were the final mean values:—

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