How air blowers, vacuum cleaners, air compressors, etc work 2
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Bernard Nebel.
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The basic principle to emphasize is that air naturally flows from where its pressure is higher to where its pressure is lower. With kids observe various fans, blowers, and pumps (google: fans and blowers diagrams) and help them analyze how the moving part(s) push the air increasing pressure on one side and decrease it on the other causing a flow.
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