Diffusion Through Air Filled Capillaries of Softwoods–Part II: Water Vapor

The transverse diffusion coefficient of moisture through wood at low moisture content values is predictable from the diffusion constant of carbon dioxide. At low moisture content values, therefore, moisture movement is essentially water-vapor movement through air-filled capillaries. The apparatus used was essentially that described in Part I. The species used was dry Sitka spruce. Air, conditioned at a definite relative humidity by bubbling through aqueous sulfuric acid, was passed through one compartment. Dry air was passed through the other compartment where it picked up the moisture that had diffused through the membrane, thence it was passed through a dehydrite weighing tube, and vented to the atmosphere through a second dehydrite tube in series with an ethylphthalate bubbler.

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