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This animation enables students in high school Earth science classes to observe how atmospheric pressure changes with respect to altitude. Students are instructed to click and drag a lever to move a balloon between altitudes of 5,000 and 30,000 feet. A pair of gauges indicates the volume in the balloon and the atmospheric pressure at each elevation. The legend indicates that the concentration of air molecules decreases with increasing altitude. Copyright 2005 Eisenhower National Clearinghouse
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