Thermal Diffusivity and Conductivity of some Soil Materials

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Abstract
Thermal diffusivities of certain soil materials, quartz sand, sandy clay, calcareous earth and packed snow, have been determined by a method based on the principle of linear heat flow in a slab whose faces are suddenly chilled. The material was packed in a narrow sheet copper box having broad faces, with a resistance thermometer in the center. After standing at room temperature for two days it was placed in stirred ice-water and the time required for the temperature to fall half-way to zero noted. This allowed direct calculation of the diffusivity, and from a knowledge of the density and specific heat, of the conductivity.

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