ABSTRACT
The construction, maintenance and calibration of a sensitive instrument capable of making numerous vapour-pressure measurements within humidity gradients by the dew-point method is described.
Coefficients of diffusion of water vapour in air, calculated from observed vapour-pressure gradients and measured rates of evaporation agree with theoretical and other experimental values in still air.
Apparent coefficients in wind speeds between 10 and 100 cm/s were significantly lower than those in still air.
This finding, together with the performance of the dew-point probe, is discussed in relation to its possible use in the study of evaporation from animals and plants."
Copyright © 1970 The Company of Biology Ltd.
1970
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