According to the conductivity measurements, graphite has a thermal conductivity of 168 W/m-K but an electrical conductivity of only 1 W/m-K. This anomaly suggests that:
1 )
The data for graphite must be incorrect
Some materials can conduct heat well without conducting electricity well
3 )
Graphite is not a true conductor but an insulator
4 )
Thermal and electrical conductivity are inversely related
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