Find the energy loss (in Joules) through a single-pane 1.5 m × 2m glass window of 3 mm thickness during a winter night in Davis (which lasts about 8 hours for an average student), if the outside temperature is 2?C and the inside temperature is 25?C. The thermal conductivity of glass is 1 W/(m · K). Assume that conduction is the only energy-loss mechanism in this problem. What is the energy loss through a double-pane window consisting of two such panes of the same thickness with a 1 cm air gap between them? The thermal conductivity of air is 0.026 W/(m · K).