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Archimedes’ principle
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Illustration showing Archimedes' principle: a 5 kg weight is weighed in air, then submerged in water, where it appears to weigh 2 kg; a separate container shows 2 kg of displaced water, demonstrating buoyant force.
Why do objects float or sink in water?
Diagram showing how a ship stays upright, with arrows indicating the downward force of gravity at the center of gravity (G) and the upward force of buoyancy at the center of buoyancy (B), both in level and tilted positions.
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Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.
Physics and Natural Law
Italian physicist Guglielmo Marconi at work in the wireless room of his yacht Electra, c. 1920.
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Why do objects float or sink in water?
Learn what determines whether an object in water will float or sink.
Video: Encyclopædia Britannica, Inc.

Images

Archimedes' principle of buoyancy
Here, a 5-kg object immersed in water is shown being acted upon by a buoyant (upward)...
Encyclopædia Britannica, Inc.
Buoyancy in ships
The weight of a ship acts through the ship's center of gravity (G). It is counteracted...
Encyclopædia Britannica, Inc.
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