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There is a layer of dry gas (e.g. argon, nitrogen) between the two panes of glass that acts as insulation, preventing heat flow in either direction between the glass panes. One thing very important is that the gas fill between the panes must be dry, or condensation will form between the panes in winter!

In industrial environmental testing temperature chambers this is taken to an extreme, with in some cases about a dozen panes of glass separated by either dry gas or vacuum to insulate the very high or very low internal temperature of the chamber from room temperature.

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9y ago

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