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A fluid that exerts buoyant force on an item that is partially submerged equals the size of the buoyant force to the weight of fluid displace

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The fluid pressure increases in proportion to the depth of the item

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It is not important to focus on the object's shape

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Discovered by greek mathematician Archimedes

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(c. 287 - c. 212 B.C.)

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The buoyant force is not considered a new type of force

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F
b = ρ × g × V

Fb | buoyant force
ρ | the density of the fluid
V | submerged volume
g | acceleration due to gravity

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An existence of upward buoyant force appears on the object

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Submarine

Hot-air balloon

Hydrometer

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The exerted upward force to an item submerged completely or partially in a fluid