Abstract
Information on the thermal properties of soils from different disciplines of science and engineering is consolidated to identify low‐cost, simple procedures for assessing the variation of the thermal resistivity of soils with changes in moisture content. Three procedures for determining the critical moisture content are presented. The critical moisture content is the moisture content at the knee of the Thermal‐resistivity‐versus‐moisture‐content curve. The optimum moisture content and plastic limit were found to be physical quan tities indicative of the critical moisture content in soils. Also, the upper flex point of the soil‐moisture‐characteristics curve appears to establish the critical moisture content in soils.
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