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.

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    If we introduce this value into the equation, we get : pv=p0v0[l + i-(T - 273)] —p0v0 (1 + 2^3-1) = P 0 v0 T 273 P0 «0 m 273 For any given mass of gas, the value of is a eon- 27 0 stant usually represented by r, so that we can give the general equation the simple form : pv =ET, N.B.—The numerical value of r depends on the unit of volume and unit of pressure chosen. We shall return to this subject. Determination of the density of a Gas or Vapour Having given a certain weight g of a gas, we have to observe : v, its volume in cubic centimetres ; p, its pressure in millimetres of mercury ; t, its temperature in degrees Centigrade. We have then all the data necessary for the calculation of the density of the gas, relatively to air. Since p v = p0 v0 (1 + a t), therefore v0 = — Po (1 + « t) will be the volume of the gas at 0° and under normal pressure. The same volume of air would weigh 0*00129 —-2^ grams, p0(l + at)b since one cubic centimetre of air at 0° and 760 millimetres pressure weighs 0*00129 grams.
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