THE VISCOSITY OF GASES

24§

which suggested to Vogel a similar relation to the
boiling temperature 2\

C = L47I\ (102)

This formula indicates that C increases
rapidly than the temperature, and since T& is
large for vapors, the less perfect agreement of
formula is partially explained. This, however, is not of
hydrogen and helium which present curious as

in Table LXVIII.

VISCOSITY AND CHEMICAL COMPOSITION

If the mass of a particle in a rarefied gas Is
by changing its chemical composition, the velocity will be
rr* times the original velocity, so that the momentum of

TABLE LXIX.—THE VISCOSITIES OF PERMANENT GASES AND

VAPORS AT 0°C

Substance
Molecular
weight
i?, X 107
TV
1* X 107

Hydrogen .......
2 0
850
31 0

Helium . ...........
4 0
1,871
5
21

Methane ...............
16.0
1,033
183.

Neon ..................
20.2
2,981

Nitrogen .........
28 0
1,678

Carbon monoxide
28 0
1^672
133.

Oxygen .................
32.0
1,920
154.

Argon ...........
39 9
2,102
155.6
1,253

Nitrous oxide
44 0
1,362

Krypton.
82.9
2,334
210.5
1,806

Xenon . .
130.2
2,107
288.
2,266

Ethyl alcohol ........
46.0
827
513.

Acetone ..................
58.0
725
510.

Methyl formate ..........
60.0
838
485.

Ethyl ether
74.1
689
467.

Benzene .................
78.0
689
561.

Methyl isobutyrate .......
88.1
701
543.

Ethyl acetate
88.1
690
523.

Ethyl propionate ..........
90.1
701
547.