FLUIDITY AND TEMPERATURE

143

from the boiling-point up to 185.7°. This agreement is shown
graphically for a number of substances in Fig. 55.

TABLE XXXVII.—CALCULATION OF THE FLUIDITY OF BENZENE FROM ITS
VOLUME BY MEANS OF THE FORMULA <f> = (V — 81.76)/0.045,35

Temperature
<p Observed
Specific volume
<f> Calculated
Difference

0.0
110.8
1.1124
111
0

10.0
131.5
1.1242
132
0

20.0
154.1
1 . 1377
155
1

30.0
178.0
1.1514
179
1

40.0
203.1
1.1661
204
1

50.0
228.8
1.1812
230
1

60.0
256.1
1.1966
256
0

70.0
284.9
1.2124
283
-2

80.0
305.8
1.2278
311
5

78.4
314.0
1.2253
310
_ 4.

100.5
383.7
1.2624
385
1

131.8
504.8
1.3255
510
5

161.4
646.8
1.3957
649
2

185.7
797.4
1.4661
794
-3

Batschinski tested his formula with the recently obtained
data of Phillips (1912) on the viscosity of carbon dioxide under
varying pressures. He thus proved that at least while the
substance remains liquid the fluidity varies directly as the free
volume.

TABLE XXXVIII. — CALCULATION OF THE FLUIDITY OF CARBON DIOXIDE

FROM ITS VOLUME BY MEANS OF THE FORMULA <p =

y _

Pressure, atmospheres
Observed
Specific volume
Calculated
Per cent, difference

110.5
1,299
1.259
1,300
0

96.0
1,443
1.316
1,450
1

82.0
1,689
1.397
1,640
-3

76.0
1,890
1.471
1,850
-2

72.0
2,183
1.575
2,080
-5