The "Overview of Thermal Conductivity of Common Outdoor Substances" is used to give a numerical judgment. Please feel free to correct any errors. For hiking tents, outdoor sleeping pads placed in the reference.
Must explain：
1, Thermal conductivity is a rigorous scientific index, in fact, there are many factors to consider, different components of different temperatures, different humidity, different densities, etc., so the same substance itself will not have a completely constant coefficient.
2, Data collated from the network of different information, papers, the same substance may be in the two information will have a certain deviation.
3、The real environment or common substances are much more complicated than the laboratory environment and single substances.
4, Although the above deviations in the values, but we are used to make a general judgment or enough.
Directly on the conclusion：
Default equal use temperature and humidity, thermal conductivity from small to large
0.06 for haystack ＜0.1 for fresh snow ＜0.177 for frozen desert in winter ＜0.225 for normal temperature desert/dry sand ＜0.26 for snow/tracked snow ＜0.349 for dry silt <0.386 for non-frozen soil in meadow area of central Tibetan plateau ＜0.523 for dry clay ＜0.762 for frozen soil in meadow area of central Tibetan plateau ＜0.861 for wet silt ＜0.9 for ordinary pavement/concrete < High-grade roads (asphalt concrete) 1.05 < Common sandy soils about 1.15 < Common clay soils about 1.2 (machine plowed roads) < Dense clay soils about 1.6 (common in southern mountainous areas) ≈ Sub-clay soils 1.6 (common in plain areas) ≈ Stone ground 1.6 ≈ Sandy beaches 1.6 ＜ Rainy concrete ground ≈ Rainy clay ground 2.0 ＜ Ice surface 2.24 ＜ Various rocks 2.0+.
