Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 59
y the arrows. Now this makes the columns at the side heavier thanthe middle one; so they crowd down, forcing some of thecold air under the middle column, as indicated by the ar-rows. This air will then be heated, will expand, and bepushed up by more cold air. So the process goes on; the cold air… … downward. These movements are called convection cur-rents. Convection currents take place in liquids as well as ingases, but cannot take place in solids. 57. Drafts in Chimneys. — Drafts in chimneys are dueto convection currents. A fire is started in the fire-box ofthe furnace. (Figure 32.) This…
Physics
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