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SMALL WIND CURRENTS Small wind currents in the classroom can be deduced by noting that heated air rises and, therefore, makes a small current of air - that is wind. If temperature readings are taken in different places in the room (e.g., at the ceiling and the floor, at the bottom and top of an open window), you will see that the movement corresponds to the exchange of warm and cool air. Does the window or door have to be open in order that there be an air current? Warm air weighs less than cold air and exerts less pressure - - thus it creates an area of low pressure. The heavier cold air creates an area of high pressure and pushes the warm air upward. If cold air pushes warm air upward, why do they build our houses with forced air heating coming out of the walls close to the ceilings? Any problems with this page? Send URL to
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