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buoyancy|ˈbɔɪənsɪ, bwɔɪ-|
Also 8 boyancy.
[f. buoyant: see -ancy.]
The quality of being buoyant.
1. a. Power of floating (on liquid or fluid); tendency to float. b. As an attribute of the liquid: Power of supporting a floating body (rare). c. Hydrostatics: Loss of weight due to immersion in a liquid; the vertical upward pressure of a liquid on an immersed or floating body, which is equal to the weight of displaced liquid; also of the lower layers of a liquid on those above.
1713Derham Phys. Theol. 9 All the winged Tribes owe their Flight and Boyancy hereunto. 1765Wilkinson in Phil. Trans. LV. 97 The cork had not..lost any force of buoyancy. 1793Smeaton Edystone L. §248 When the stone was got up to the surface of the water..becoming heavier by losing its buoyancy. 1831Lardner Hydrostat. v. 97 The support, whether partial or total, which a solid receives from a liquid..is expressed by the term buoyancy. 1868Wright Ocean World i. 19 The saltness of sea water increases its density, and at the same time its buoyancy.
2. fig. Elasticity of spirit, lightheartedness; capacity for recovering after depression.
1819Blackw. Mag. Aug., The reckless buoyancy of young blood. 1824Dibdin Libr. Comp. 516 There is neither fancy, nor brilliancy, nor buoyancy, about him. 1866Dickens Lett. (1880) II. 249, I have noticed..a decided change in my buoyancy and hopefulness. 1886Morley Crit. Misc. III. 102 To the last he retained his extraordinary buoyancy.
3. Tendency to rise (in the price of stocks and shares), in the national revenue, etc.
1883Manch. Exam. 14 Dec. 4/1 Considerable buoyancy was developed owing to a smart recovery on the Paris Bourse.
4. attrib., as buoyancy chamber, buoyancy garment, buoyancy tank.
1930Engineering 17 Jan. 69/1 The buoyancy chamber..is divided by a longitudinal watertight bulkhead along the centre line. 1959A. Hardy Fish & Fisheries i. 1 Many of the fish are swollen..as their air-bladders (buoyancy chambers) are violently distended.
1962B.S.I. News May 9/2 Buoyancy garments are being used in increasing numbers by yachtsmen, canoeists and other ‘weekend’ sailors.
1928C. F. S. Gamble Story of North Sea Air Station xviii. 309 In order to dive a submarine her commander fills the buoyancy tanks with sea-water. |
