378
VAPOR-DENSITIES.
due to the neutral gas. This result, which may be extended to any number of neutral gases, is simply an expression of Dalton's Law.
We now proceed to the comparison of the formulæ, especially of equation (6), with the results of experiment.
Temperature | Pressure | Density calculated by eq. (10). |
Density observed. | Excess of observed density. | |||||||||||
Deville & Troost | Deville & Troost | ||||||||||||||
M—h. | M—h. | ||||||||||||||
M—r. | I. | II. | III. | M—r. | I. | II. | III. | ||||||||
183.2 | (760) | 1.592 | 1.57 | -.022 | |||||||||||
154.0 | (760) | 1.597 | 1.58 | -.017 | |||||||||||
151.8 | (760) | 1.598 | 1.50 | -.10 | |||||||||||
135.0 | (760) | 1.607 | 1.60 | -.007 | |||||||||||
121.8 | (760) | 1.622 | 1.64 | +.02 | |||||||||||
121.5 | (760) | 1.622 | 1.62 | -.002 | |||||||||||
111.3 | (760) | 1.641 | 1.65 | +.009 | |||||||||||
100.25 | 760 | 1.677 | 1.72 | -.04 | |||||||||||
100.1 | (760) | 1.676 | 1.68 | +.004 | |||||||||||
100.0 | (760) | 1.677 | 1.71 | +.03 | |||||||||||
90.0 | (760) | 1.728 | 1.72 | -.008 | |||||||||||
84.4 | (760) | 1.768 | 1.83 | +.06 | |||||||||||
80.6 | (760) | 1.801 | 1.80 | -.001 | |||||||||||
79 | 748 | 1.814 | 1.84 | +.03 | |||||||||||
77.4 | (760) | 1.833 | 1.85 | +.02 | |||||||||||
70.0 | (760) | 1.920 | 1.92 | .000 | |||||||||||
70 | 754.5 | 1.919 | 1.95 | +.03 | |||||||||||
68.8 | (760) | 1.937 | 1.99 | +.05 | |||||||||||
66.0 | (760) | 1.976 | 2.03 | +.05 | |||||||||||
60.2 | (760) | 2.067 | 2.06 | -.013 | |||||||||||
55.0 | (760) | 2.157 | 2.20 | +.04 | |||||||||||
52 | 757 | 2.211 | 2.26 | +.05 | |||||||||||
49.7 | (760) | 2.255 | 2.34 | +.09 | |||||||||||
49.6 | (760) | 2.256 | 2.27 | +.014 | |||||||||||
45.1 | (760) | 2.342 | 2.40 | +.06 | |||||||||||
39.8 | (760) | 2.443 | 2.46 | +.017 | |||||||||||
35.4 | (760) | 2.524 | 2.53 | +.006 | |||||||||||
35.2 | (760) | 2.528 | 2.66 | +.13 | |||||||||||
34.6 | (760) | 2.539 | 2.62 | +.08 | |||||||||||
32 | 748 | 2.582 | 2.65 | +.07 | |||||||||||
28.7 | (760) | 2.642 | 2.80 | +.16 | |||||||||||
28 | 751 | 2.652 | 2.70 | +.05 | |||||||||||
27.6 | (760) | 2.661 | 2.70 | +.04 | |||||||||||
26.7 | (760) | 2.676 | 2.65 | +.026 |
Peroxide of nitrogen.—If we take the constants of the equation for this substances from the paper already cited,[1] we have
(10) |
denoting the temperature on the centigrade scale. The numbers 3.178 and 1.589 represent the theoretical densities of N2O4 and NO2
- ↑ See equation (336) on page 177,—also the following equations in which the density is given in terms of the temperature and pressure. In comparing these equations, it must be observed that in (336) the pressures are measured in atmospheres, but in this paper in milimeters of mercury.