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Someone wrote "what material has the highest R-value".

This answer is not conducive to progress in their learning. The "r" in R-value stands for Resistance, that is, resistance to flow of heat.

Conductivity is the reciprocal, or inverse, of the Resistivity.

"Thermal Conductivity" is transfer of Heat. Since Heat is ultimately the jiggling around of small bits of Matter (fundamental particles like electrons, protons and neutrons), then atoms (assemblages of these 3 fundamental particles), then molecules (assemblages of similar or dissimilar atoms), or also the jiggling around of atoms within molecules) - then the material with the highest Resistivity would be the Absence of Matter, this is, Vacuum (not quite a material, strictly speaking, but "found" between the walls of a vacuum, or "Dewar", flask).

For the material with (possibly) the lowest Resistivity, or highest Conductivity, try the Wikipedia article on "Thermal Conductivity". If you're a girl, it may be your best friend.

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15y ago

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