Outlines of physical chemistry / by A. Reychler ; translated form the French with the author's permission by John McCrae.

  • Reychler, A. (Albert), 1854-
Date:
1904
Catalogue details

Licence: In copyright

Credit: Outlines of physical chemistry / by A. Reychler ; translated form the French with the author's permission by John McCrae. Source: Wellcome Collection.

    27/302 page 7
    Now, the gas under investigation weighs G grams ; therefore, its density will be G -7- 0-00129 s (1 + a w G (1 -fa t)p0 0'00129pv Several methods for the determination of g, p, v, and t have been proposed. Dumas, Gay-Lussac, and Hofmann have elaborated classical methods which are described in every text-book on physics. In chemical laboratories V. Meyer's displacement method is pre- ferably followed. In the figure (fig. 1) a repre- sents a reservoir of about 100 cubic centimetres capacity. The vertical tube, b, has an internal diameter of three to four milli- metres, and the lateral branch, c, is a capillary tube. The interior of this apparatus is dried by means of a current of hot air then introduced into the bath d ; and the pneumatic trough e is so adjusted that the opening of the capillary tube is under water. The bath contains a liquid whose boiling point is at least fifty degrees higher than the boiling point of the substance the vapour density of which is to be determined. By means of a Bunsen burner, the flame of which can be easily regulated, the liquid in the bath is brought to boiling, so that the cylindrical bulb a is well enveloped in vapour. As the tube b is closed by a stopper, the air expelled by expansion escapes by the capillary tube and rises in bubbles through the water in the pneumatic
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