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Fluids move from areas of high pressure to low pressure

I need an experiment to demonstrate how fluids move from areas of high pressure to low pressure. My teacher has given examples, but I can't use any of hers. I've been working for days and am stuck and under the gun.

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Human lungs draw air in by expanding the chest and thus creating a pressure differential between the lungs and the outside. When the chest expands, the volume inside the lungs increases and the ...

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