Journal of the Meteorological Society of Japan. Ser. II
Online ISSN : 2186-9057
Print ISSN : 0026-1165
ISSN-L : 0026-1165
On the Effective Humidity (1st Report)
Masamichi Oi
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1951 Volume 29 Issue 8 Pages 266-273

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Abstract

The water content of woods, charcoal or paper, etc., is said to be dependent upon the effective humidity which is defined by Dr. H. Hatakeyama and is mainly referring to the relative humidity. But the author, computing from the stand point of the adsorption by which the absorption may be effected, derived a formula containing the absolute and relative humidities in the form: (Ha)α×(Hr)β, Where
Ha: absolute humidity, Hr: relative humidity, α, β: exponential coefficients characteristic of the substances and slightly dependent upon their temperature. This formula seems to explain satisfactorily the water content of various substances and therefore the various phenomena relating to fire-breaks, etc.

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