Absorption of Water by Films of Cellophane and Polyvinyl Alcohol

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Abstract
The absorption of water and dehydration of these films is found to obey a diffusion equation by means of which a diffusivity may be defined. This is not a constant but depends on the water concentration in the foils. A rapid change in water content immediately after changing the ambient conditions suggests the presence of adsorbed surface layers. The total absorption is found to increase faster than the relative humidity.

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