Chapter 20577Q20.20At night, the Styrofoam beads would decrease the overall thermal conductivity of the windows, andthus decrease the amount of heat conducted from inside to outside. The air pockets in the Styrofoamare an efficient insulator. During the winter day, the influx of sunlight coming through the windowwarms the living space.An interesting aside—the majority of the energy that goes into warming a home fromsunlight through a window is notthe infrared light given off by the sun. Glass is a relatively goodinsulator of infrared. If not, the window on your cooking oven might as well be just an open hole!Glass is opaque to a large portion of the ultraviolet range. The glass molecules absorb ultravioletlight from the sun and re-emit the energy in the infrared region. It is this re-emitted infraredradiation that contributes to warming your home, along with visible light.Q20.21In winter the produce is protected from freezing. The heat capacity of the earth is so high that soilfreezes only to a depth of a few decimeters in temperate regions. Throughout the year the
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .