Archimedes’ principle

principle · 250 BC · Ancient world

A submerged body is pushed up by a buoyant force.

Where it is used

• Ballast tank — is used in. Changing buoyancy.
• Boat — is used in. A vessel stays afloat by Archimedes’ principle.
• Hull — is used in. The hull displaces water.
• Hot air balloon — is used in. Warm air is lighter than cold — Archimedes’ principle in the atmosphere.
• Hydrometer — is used in. A hydrometer floats: the buoyant force depends on the liquid's density, so how deep it sinks shows the density.
• Keel — is used in. The keel and ballast provide stability.
• Seaplane — is used in. Floats.
• Weather balloon — is used in. A balloon filled with hydrogen or helium.
• Diving bell — is used in. Sinking with ballast.
• Surfboard — is used in. Buoyancy.
• Amphibious vehicle — is used in. It floats.
• Offshore drilling platform — is used in. Floating platforms.
• Ferry — is used in. It stays afloat by Archimedes’ principle.

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