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.
Glass, wood and plastic are all excellent insulators, but not good conductors.
How well does glass conduct heat?
Glass isn’t as good a conductor of heat as metal, but it’s great insulator, making it retain heat well. Because of this glass performs a lot like dark metal — foods absorb more heat and bake faster, making glass a good choice for pies and some breads.
Why is glass a poor conductor of heat?
Glass is a very poor heat conductor. It has one of the lowest possible heat conduction a solid (without air trapped in it) can possibly have, this is mostly due to its lack of ordered crystal structure. Since it’s an insulator, the electronic contribution to the thermal conductivity is very small.
Is glass a better conductor of heat than plastic?
Window glass is better than most plastics, and certainly better than “clear” fiberglass. So it is with electrical conductors, some being better than others. Glass, for instance, is a very good insulator at room temperature, but becomes a conductor when heated to a very high temperature.
Is wood a good conductor of heat?
Wood is a poor conductor of heat (as well as other forms of energy) because it is covalently bound as a compound. As a result, it does not have the free electrons that scatter about to conduct different forms of energy like metals and other strong conductors do.