248

FLUIDITY AND PLASTICITY

TABLE LXVIL—CONCORDANCE BETWEEN SUTHEHLAND'S FORMULA AND
HOLMANT'S DATA FOB CARBON DIOXIDE. C = 277, ij0 = 0.000,138,0

Temperature, degrees Centigrade
i\ X 107 observed
17 X 107 calculated

18.0
1,474
1,471

41.0
1,581
1,584

59.0
1,674
1,671

79.5
1,773
1,766

100.2
1,864
1,864

119.4
1,953
1,951

142.0
2,048
2,056

158.0
2,121
2,127

181.0
2,234
2,227

224.0
2,411
2,409

of C for different substances increase with the critical tempera-
ture or boiling-point of the substance. Rankine (1910) obtained
an empirical relation between C and the absolute critical tempera-
ture Tcr

Tcr = 1.12C (101)

TABLE LXVIII.—THE RELATION- OF THE CONSTANT C IN SUTHERLAND'S
EQUATION TO THE BOILING-POINT AND CRITICAL TEMPERATURE

Substance
TCr3 Critical temperature, absolute
C
Tcr/C
Tb, Boiling temperature, absolute
C/Tb

Helium ............ . .....
9.0
78.2
0.11
4.3
18.3

Hydrogen .................
37.0
83.0
0.45
20.4
4.1

Nitrogen. ............
127.0
113.0
1.12
77.5
1.45

Carbon monoxide . . .
133.0
100.0
1.33
83.0
1.20

Oxygen .........
154.0
138.0
1.12
90.6
1.52

Nitric oxide ...............
179.5
167.0
1.08
120.0
1.39

Ethylene ......
383.6
249.0
1,14
170.0
1.46

Carbon dioxide ............
304.0
259.0
1.17
194.0
1.33

Ammonia .................
423.0
352.0
1.20
240.0
1.47

Ethyl ether ............
467.0
325.0
1.43
307.0
1.06