Electrolytic hygrometry

Electrolytic hygrometry in which the quantity of electricity required to electrolyse water absorbed from the atmosphere on to a thin film of desiccant is measured. 

Discussion. The study of the stability of the IH and 3R polytypes, in relation to hygrometry or temperature, shows that the two phases coexist in a notable range of relative hiunidities or temperatures. This behavior is thermodynamically inconsistent with a phase transition exclusively involving a variation of the hydration state. The IH type seems stabilized by the presence of residual electrolytes adsorbed at the surface of the crystallites. So, for less washed samples, the IH type is stabilized whereas the most washed... 

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