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Meaning of Archimedes' principle

Ar'chime'des' prin'ciple

Pronunciation: [key]
— Physics. Physics.
  1. the law that a body immersed in a fluid is buoyed up by a forceequal to the weight of the fluid displaced by the body.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.