A text-book of physical chemistry / by R.A. Lehfeldt.

  • Robert Alfred Lehfeldt
Date:
[pref. 1899]
Catalogue details

Licence: Public Domain Mark

Credit: A text-book of physical chemistry / by R.A. Lehfeldt. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    ineasiu-ed, calling the difference of (i) and (ii) Wq, and the difference between (i) and (iii) W, we have true weight of water = W^xl-Q0\05, true weight of experimental liquid = ]r+o-ooi2Tr„-o-oooi5 >r, and the specific gravity referred to water at the temperature of the experiment is lF+0-0012 I'Fo-0-00015 W D = 1-00105 This must be multiplied by the density of water at f to give the actual density of the other liquid. The density of water is given in the following table ': the temperature is measured on the normal hydrogen scale. Temperature. Density. Specific volume. o 0-9998679 1-0001321 3.98 I I 10 0-9997272 I-0002728 15 0.9991263 1-0008745 20 0-9982298 1-0017733 25 0-9970714 1-0029372 30 0-9956732 1.0033456 35 0-9940576 1.0059779 40 0-9922417 1-0078190 § 2. Thermal Expansion of Fluids. The absolute density or specific volume of a liquid having been determined at one temperature by the pyknometer, the change of density with temperature may most con- veniently be found by a dilatometer such as that shown in Fig. 14. It consists of a bulb of 5 to 10 c.c. capacity, provided with two capillary tiibes : of these, one is merely for the purpose of convenient filling, the other plays the same part as the tube of a thermometer. The end of & is immersed in the liquid to be measured, and by sucking at a the dilatometer is filled as far as the lowest mark ' Thiessen, Scheel, and Diesselhorst, Wied. 60. 340-9 (97).
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