Is glass a good thermal conductor?
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Glass is actually an insulator. It doesn't allow the flow of electrons easily from atom to atom, as seen in substances like copper, and other metals which are excellent conductors of both heat and electricity. Insulators have electrons that are held tightly which means they aren't shared between other atoms. Glass resists heat and electricity from passing through it. Glass, wood and plastic are all excellent insulators, but not good conductors. Glass has been made for thousands of years and it made of sand, soda and lime. Glass can be seen in thermos bottles due to the fact that it doesn't easily allow the transfer of heat easily through it, keeping the temperature of the liquid inside the thermos fairly constant.
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