Vol. 50 by using a thermometer graduated to 0.1°, which was compared with one recently calibrated by the Bureau of Standards. The filled pycnometer was weighed at each temperature and the density, given in Table I, was calculated from these weights. The coeEcient of cubical expansion of Pyrex glass used was that recently obtained by BuEngton and Latimer.3 All weights were reduced to vacuum.No recent determination of the density of bromoform has been made and those in the literature are not in close agreement. However, that of Perkin,4 2.9045 g./cc. at 15°, and the value selected for the International Critical Tables, 2.890 at 20°, agree well with our values.The following empirical equation for the variation of specific volume with temperature was obtained by the method of least squares from the data in Table I.Vi = 0.24204 [1 + 0.00090411 (/ -7.7) + 0.0000006766 (t -7.7)2](1)The values calculated by the aid of this equation differ by not more than three units in the last decimal place from the experimental points.
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