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Principles of Operation 3098 Technical Manual
B-2
ρ
2
2
2
22
M
P
ZRT
K = =
(6)
If now the two gases can be maintained at the same temperature, from equations 4 and 6:
ρ
1
1
12
1
2
1
=
P
=
2
M
ZRT
KM
Z
Z
(7)
Finally, by using the sample gas (or a gas having a similar supercompressibility factor) as the reference gas:-
ρ
11
= KM (8)
Since
ZZ
12
=
Thus the density of the sample gas, under the stated conditions, is directly related to its molecular weight and
therefore directly related to its specific gravity by equation 1.