Compute the ratio of the rate of heat loss through a single pane window with area 0.15 m2 to that fur a double-pane window with the same area. The glass of a single pane is 4.2 mm thick, and the air space between the two panes of the double pane window is 7.0 mm thick. The glass has thermal conductivity 0.80 W/m. K. The air films on the room and outdoor surfaces of either window have a combined thermal resistance of 0.15 m2 • K/W.