MLA Citation: Bloomfield, Louis A. "Question 175"
How Everything Works 23 Jul 2018. 23 Jul 2018 <http://howeverythingworks.org/print1.php?QNum=175>.
175. Why doesn't glass have electrons to carry heat. What is glass made of?
Like everything in our world, glass does have electrons. Its atoms are built out of electrons. But those electrons are localized on the individual atoms or between them in such a way that they can't move easily. When you try to push these electrons through the glass, they won't go. Thus neither heat nor electricity flows easily through glass. In a metal, some of the electrons are mobile and can carry heat and electricity.

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