Stopwatch and hourglass | Measurement | Physics
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Stopwatch and hourglass | Measurement | Physics
This video introduces one of the oldest methods of keeping time - an hour glass. Two chambers separated by a thin tube for restricting the rate of flow of sand, is called an hourglass. The time taken for gravity to empty one chamber into another, depends on the thickness of the separating tube, as well as on the size of the grains.
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