BUOYANCY

buoyancy. Buoyancy, n. the quality of floating, lightness

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Buoy″an‐cy (�), n.; pl. Buoyancies (�). 1. 1. The property of floating on the surface of a liquid, or in a fluid, as in the atmosphere; specific lightness, which is inversely as the weight compared with that of an equal volume of water.
2. 2. (Physics) The upward pressure exerted upon a floating body by a fluid, which is equal to the weight of the body; hence, also, the weight of a floating body, as measured by the volume of fluid displaced.
Such are buoyancies or displacements of the different classes of her majesty's ships. Eng. Cyc. 3. 3. Cheerfulness; vivacity; liveliness; sprightliness; — the opposite of heaviness; as, buoyancy of spirits.