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:''The rule that the weight of fluid that a submerged object displaces is the same amount of buoyancy force applied to the submerged object.''.
It is named after [[Archimedes]] of [[Syracuse, Italy|Syracuse]], who first discovered this law. [[Vitruvius]] ([[De architectura]] IX.9–12) recounts the famous story of Archimedes making this discovery while in the bath (for which see [[Eureka (word)|eureka]]) but the actual record of Archimedes' discoveries appears in his two-volume work, ''On Floating Bodies''. The ancient [[Chinese people|Chinese]] child prodigy [[Cao Chong]] also applied the principle of buoyancy in order to measure the accurate weight of an elephant, as described in the [[Sanguo Zhi]].
The weight of the displaced fluid is directly proportional to the volume of the displaced fluid (specifically if the surrounding fluid is of uniform density). Thus, among objects with equal masses, the one with greater volume has greater buoyancy.
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