Materials acc. IEEE 442

The IEEE Standard 442 'Guide for Soil Thermal Resisitvity Measurement' provides a procedure to measure the thermal resistivity of the soil and values of the thermal resistivity $\rho$ for some materials.

Symbol
$M_{IEEE}$
Related
$\rho_{4}$
Choices
Material
 
Thermal resistivity
K.m/W
Quartz grains0.11
Granite grains0.26
Limestone grains0.45
Sandstone grains0.58
Mica grains1.7
Water1.65
Organic wet4.0
Organic dry7.0
Air40.0