Why is glass see-through?
Brains On! Science podcast for kids
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How to Make Glass From Molten Glass
Molecules are so tightly packed that even though i'm passing through the molecules, i'm getting scattered every which way. The molten glass inside the furnaces is almost five feet deep. That's over 300 tons of molten glass, or about the same weight as two blue whales. It takes a lot of energy to make glass from scratch but melting down already manufactured glass takes a lot less energy.
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