In the winter, what is the main reason for the advantage, from an energy conserv

Question

In the winter, what is the main reason for the advantage, from an energy conservation point of view, of having an air gap between the panes of glass in a double-paned window? (You may assume that the air gap is the same thickness as each of the panes of glass.)
a. There is no advantage, double-paned windows have an air gap to reduce image distortion due to refraction.
b. The air gap increases the thickness through which heat must flow.
c. The much lower thermal conductivity of air compared to glass results in a much lower overall rate of heat
flow.

Explanation / Answer

c)

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