THE 
LONDON, EDINBURGH ann DUBLIN 
PHILOSOPHICAL MAGAZINE 
AND 
JOURNAL OF SCIENCE. 
[FOURTH SERIES, ] 
JUNE 1861, 
eee 
LXI. On a Law of Liquid Kxpansion that connects the Volume of 
a@ Liquid with its Temperature and with the Density of its satu- 
rated Vapour. By Joun Jamns Warenstron*, sq. 
| With a Plate. | 
$1. 1 tee the archives of the Royal Society for 1852, there is 
an account of observations on the density of hquids 
and their superjacent vapours at high temperatures, made in sealed 
graduated tubes filled with the same liquid in different propor- 
tions of their volumes. The general law of density in saturated 
vapours deduced from these observations, and from the various 
observations of vapour-tension already published by other phy- 
sicists, is therein set forth, with the assistance of a chart (No. 2 
chart) in which the observations are all projected, and lines 
drawn, that enables the eye to judge of the accordance between 
theory and observation. (See Note A.) 
An account of this general law is also given in the Philoso- 
eel Magazine for Mareh 1858, in a paper entitled “On the 
§vidence of a Graduated Difference between the ‘Thermometers 
of Air and Mereury between 0° and 100° C.” 
By the same mode of observing in sealed graduated tubes, | 
afterwards extended the observations up to the transition-point 
of three of the liquids, viz. aleohol, ether, and sulphate of carbon, 
and found that the law of vapour-density was maintained in them 
Without deviation to their extreme limiting temperatures, As 
these extensive series of observations supplied the curves of ex- 
pansion of the three liquids, I have occasionally tried by means 
of them to discover a general law of liquid expansion, T submit 
the following account of the last attempt of this kind, as it ap- 
pears to be successful. 
* Communicated by the Author. 
Phil, Mag. 8. 4, Vol. 21, No, 142, June 1861, 2D 
