Archimedes' principle indicates that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces . Archimedes' principle is a law of physics fundamental to fluid mechanics .
An empty 1-litre plastic bottle released in the air will fall down due to the gravitational force of the Earth acting on it. If the same bottle is released under water, the same gravitational force acts on it, but it will be pushed upwards towards the surface of the water. The extra force that pushes the bottle upwards comes from the upthrust or Archimedes force.
The Archimedes principle allows the volume of an object to be
measured by measuring the volume of the liquid it displaces after
submerging, and the buoyancy of an object immersed in a liquid to be
calculated.
For any immersed object, the volume of the submerged portion equals
the volume of fluid it displaces. E.g., by submerging in water half of a
sealed 1-liter container, we displace a half-liter volume
of fluid, regardless of the container's contents. If we fully submerge
the same container, we then displace one liter of liquid, which exactly
equals the volume of the 1-liter container.An empty 1-litre plastic bottle released in the air will fall down due to the gravitational force of the Earth acting on it. If the same bottle is released under water, the same gravitational force acts on it, but it will be pushed upwards towards the surface of the water. The extra force that pushes the bottle upwards comes from the upthrust or Archimedes force.
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