A single-pane window is a poor insulator. On a cold day, the temperature of the inside surface of the window is often much less than the room air temperature. Likewise, the outside surface of the window is likely to be much warmer than the outdoor air. The actual surface temperatures are strongly dependent on convection effects. For instance, suppose the air temperatures are 21.5 °C inside and -3.0 °C outside, the inner surface of the window is at 8.5 °C, and the outer surface is at 4.1 °C. At what rate will heat flow through the window? Take the thickness of the window to be 0.32 cm, the height to be 1.2 m, and the width to be 1.4 m.
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