What is the rate of heat loss through a glass window 30 mm, Ask an Expert

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What is the rate of heat loss through a glass window 3.0 mm thick if the outside temperature is -20 degrees C and the inside temperature is 20 degrees C? If a storm window is installed having the same thickness of glass but with an air gap of 7.5 cm between the panes, what will be the corresponding rate of heat loss?

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