Ne = ---------- electrostatic units,
K
where u1 is the velocity for 1 volt (i.e. ¹⁄₃₀₀ E. S. unit) per cm.
It is known that one absolute electromagnetic unit of electricity in passing through water liberates 1·23 c.c. of hydrogen at a temperature of 15° C. and standard pressure. The number of atoms in this volume is 2·46N, and, if e´ is the charge on the hydrogen atom in the electrolysis of water,
2·46 Ne´ = 3 × 1010 E. S. units,
Ne´ = 1·22 × 1010 E. S. units.
e u1
Thus --- = 2·46 × 10-2 ---
e´ K
For example, substituting the values of u1 and K determined in moist air for the positive ion,