In the reference table are presented the experimental data of the mobility of ions of some gases is positive (μ⁺) and negative (μ^-) measured in [cm²/V*s]. The gas pressure corresponds to the normal, and the temperature of 18-20° C. Also, an approximate value of molecular weight gases (M).

Gas	M	μ+	μ-
Nitrogen	28	1.27	1.84
Ammonia	17	0.74	0.80
Benzene	78	0.18	0.21
Hydrogen	2	6.70	7.95
The air	29	1.38	1.87
Helium	4	5.09	6.31
Nitrous oxide	44	0.82	0.90
Oxygen	32	1.32	1.83
Carbon monoxide	28	1.10	1.40
Water vapor	-	0.47	0.43
Carbon dioxide	44	0.84	1.05

The motion of ions in gases under a constant and relatively small electric fields, the average value of the speed \(v\) in the direction of the lines of force of this field is proportional to the tension \(E\): \[v = \mu E \] the Coefficient of proportionality is the mobility of ions \(\mu\).