THE VI8COMTY OF C/JXEK 251

depicted In Fig. 82, The critical constants of and

*e not yet been determined. Rankine has further
sam-« general formula applies to the but

different being 10.23 X 1Q~10. He for iyf =

XI !0~7 and for bromine ye = 2,874 X ID™"7 (ff. Fig. S2).
v^re to use the molecular weights instead of the atomic
ts? "the constant would be 5.12 X 10™ 18 which is that

"the jraxe gases but still not identical with it.

THE VISCOSITY OF GA.SEOUS MIXTURES

SInco in a rarefied gas the viscosity is to the

of molecules in a unit volume, i.e., to the
viscosities will be additive when arc in

percentages by volume; but since the viscosity of a gas

is also independent of the weight of the the law

loses its significance.

In gaseous mixtures at ordinary pressures the

1 = ~

applies, it being merely necessary to find the
mean -values of p, V, and L. This has by

(1S68) and Puluj (1879), and one obtains the (cf.

IVteyer^s Kinetic Theory of Gases, page 201 el seq.)

Gratiam (1846) observed that mixtures of oxygen
or- oxygen and carbon dioxide in all proportions
of traxispiration which are the arithmetical of the two

components. Thus for air,

0.0001678 X0.7919 -
0.0001920 X 0.2081 -

Calculated ^ri^iosity of air........... 0.6001728
Observed Tiscosity of air........... 0. (1914).
and others have noticed that when is in