WordReference Random House Unabridged Dictionary of American English © 2020
Archimedes' principle, [Physics.]
  1. Physicsthe law that a body immersed in a fluid is buoyed up by a force(buoyant force) equal to the weight of the fluid displaced by the body.

Collins Concise English Dictionary © HarperCollins Publishers::
Archimedes' principle n
  1. a law of physics stating that the apparent upward force (buoyancy) of a body immersed in a fluid is equal to the weight of the displaced fluid
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