Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 105
the flaskwhen filled with hot airweighs less than when filledwith cold air. Why does a stove draw ?-To understand why astove draws we will firstmake the experiment illus-trated in Fig. 65. The ap-paratus consists of a rec-tangular wooden box witha glass front and with twoholes in the top, each… … FIG. 65. — A convection current in air. HEAT IN THE HOME 91 smoke paper or a lighted Chinese joss stick over the coldchimney. We learned above that cold air is heavier, volume for volume,than hot air. The weight of any body is due to the attractionof the earth for it. The cold air, then, is pulled…
Physics · Home Economics
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