The velocity of evaporation of water at the surface of fishbody is mainly proportional to the difference of vapour tension
E'-e (in mmHg) between the surface and runing air. When the fishes are dried in the solar radiation, the intensity of which is
Qs (in cal/cm
2hr), the next relation holds approximately:-
E'-e=A(E-e)+BQs where
E-e is the saturation difference of air and
A and
B are constants depending upon the temperature as shown in Table 2. The calculated time of drying using the value of
E'-e given by the above relation is well coincid with the value observed.
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