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Soil Table 1: (English) Thermal Conductivity and Diffusivity of Sand and Clay Soils*
Soil Type
Dry 
Density
5% Moist
10% Moist
15% Moist
20% Moist
k

k

k

k

Coarse
100% Sand
120
1.2-1.9
0.96-1.5
1.4-2.0
0.93-1.3
1.6-2.2
0.91-1.2
-
-
100
0.8-1.4
0.77-1.3
1.2-1.5
0.96-1.2
1.3-1.6
0.89-1.1
1.4-1.7
0.84-1.0
80
0.5-1.1
0.60-1.3
0.6-1.1
0.60-1.1
0.6-1.2
0.51-1.0
0.7-1.2
0.52-0.90
Fine Grain
100% Clay
120
0.6-0.8
0.48-0.64
0.6-0.8
0.4-0.53
0.8-1.1
0.46-0.63
-
-
100
0.5-0.6
0.48-0.58
0.5-0.6
0.4-0.48
0.6-0.7
0.37-0.48
0.6-0.8
0.41-0.55
80
0.3-0.5
0.36-0.6
0.35-0.5
0.35-0.5
0.4-0.55
0.34-0.47
0.4-0.6
0.30-0.45
*Values indicate ranges predicted by five independent methods. (1)
k = Thermal Conductivity, = Thermal Diffusivity
Coarse Grain= 0.075 to 5mm - Fine Grain less than 0.075mm (0.075mm = #200 U.S. Standard Sieve)

1. O.T. Farouki, "Evaluation of Methods for Calculating Soil Thermal Conductivity," U.S. Army Cold Regions Research and Engineering Laboratory Report 82-8, Hanover, NH, 1982.

 

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