the electric resistivity published in the Handbook of Chemistry and Physics (CRC). Because different samples were likely used in the two measurements and because the conductivities are very sensitive to the degree of impurity, one cannot have great confidence in the ratios displayed.

In addition, the measurement of thermal conductivity is probably not accurate beyond the second significant figure. More importantly, the assumption that electrons are the only carriers of heat in a solid is only an approximation for metals and is not valid for most other materials, as we will discuss in more detail later in this text.

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