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An hourglass is a creation that simply uses the gravitational pull of the earth to move sand or other types of particles in an upper chamber down through a thin canal into a lower chamber. Usually they are engineered to approximate a certain length of time from when all the particles are in the top, to when all the particles are in the bottom.

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โˆ™ 2008-08-17 06:59:09
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Q: What type of energy does a hourglass use?
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