buoyancyn.
/ˈbɔɪənsi//ˈbwɔɪənsi/ The quality of being buoyant.
1.
a. Power of floating (on liquid or fluid); tendency to float.
ΘΚΠ
the world > matter > properties of materials > lightness > [noun] > rising due to lightness > buoyancy
buoyantness1668
buoyancy1713
corkiness1845
the world > matter > liquid > action or process of floating > [noun] > ability or capacity for
buoyancy1766
natability1796
floatage1877
1713 W. Derham Physico-theol. i. i. 9 All the winged Tribes owe their Flight and Boyancy hereunto.
1766 J. Wilkinson in Philos. Trans. 1765 (Royal Soc.) 55 97 The cork had not..lost any force of buoyancy.
b. As an attribute of the liquid: Power of supporting a floating body (rare).
ΘΚΠ
the world > matter > liquid > action or process of floating > [noun] > liquid: power of supporting bodies on surface
buoyancy1868
1868 E. P. Wright Ocean World i. 19 The saltness of sea water increases its density, and at the same time its buoyancy.
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.
ΘΚΠ
the world > matter > physics > mechanics > dynamics > statics > [noun] > hydrostatics or rheostatics > buoyancy
buoyancy1793
1793 J. Smeaton Narr. Edystone Lighthouse (ed. 2) §248 When the stone was got up to the surface of the water..becoming heavier by losing its buoyancy.
1831 D. Lardner Hydrostatics v. 97 The support, whether partial or total, which a solid receives from a liquid..is expressed by the term buoyancy.
2. figurative. Elasticity of spirit, lightheartedness; capacity for recovering after depression.
ΘΚΠ
the mind > emotion > pleasure > cheerfulness > [noun] > cheerful optimism
sanguine1530
toujours gai1711
optimism1812
buoyancy1819
buoyance1821
rhathymia1936
1819 Blackwood's Edinb. Mag. Aug. The reckless buoyancy of young blood.
1824 T. F. Dibdin Libr. Compan. 516 There is neither fancy, nor brilliancy, nor buoyancy, about him.
1866 C. Dickens Let. 9 Feb. (1999) XI. 155 I have noticed..a decided change in my buoyancy and hopefulness.
1886 J. Morley 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.
ΘΚΠ
society > trade and finance > stocks and shares > [noun] > prices of stocks and shares > rise or tendency to rise
rally1826
results1829
bull run1882
buoyancy1883
firming-up1896
recovery movement1896
performance1926
upside1961
1883 Manch. Examiner 14 Dec. 4/1 Considerable buoyancy was developed owing to a smart recovery on the Paris Bourse.
Compounds
General attributive.
buoyancy chamber n.
ΘΚΠ
the world > matter > properties of materials > lightness > [noun] > rising due to lightness > buoyancy > device providing buoyancy > specific
cork1496
air chamber1664
pontoon1676
buoyancy tank1928
buoyancy chamber1930
1930 Engineering 17 Jan. 69/1 The buoyancy chamber..is divided by a longitudinal watertight bulkhead along the centre line.
1959 A. Hardy Fish & Fisheries i. 1 Many of the fish are swollen..as their air-bladders (buoyancy chambers) are violently distended.
buoyancy garment n.
ΘΚΠ
the world > textiles and clothing > clothing > types or styles of clothing > [noun] > for specific purpose > other
dress1539
khilat1684
sweaters1828
tropicals1880
trade dress1887
sportswear1903
rat-catcher1910
rainwear1913
beach-wear1928
transitioner1941
camouflage1945
warm-up1949
buoyancy garment1962
athleisure1976
1962 B.S.I. News May 9/2 Buoyancy garments are being used in increasing numbers by yachtsmen, canoeists and other ‘weekend’ sailors.
buoyancy tank n.
ΘΚΠ
the world > matter > properties of materials > lightness > [noun] > rising due to lightness > buoyancy > device providing buoyancy > specific
cork1496
air chamber1664
pontoon1676
buoyancy tank1928
buoyancy chamber1930
1928 C. F. S. Gamble Story N. Sea Air Station xviii. 309 In order to dive a submarine her commander fills the buoyancy tanks with sea-water.
Draft additions September 2013
buoyancy compensator n. Diving an inflatable vest worn while scuba-diving whose buoyancy can be increased or decreased, esp. so as to establish neutral buoyancy or to facilitate ascent to the surface; abbreviated BC.
ΚΠ
1970 Sub-aqua Mag. Nov. 20/2 There is also in common use in the South Pacific area a variety called a buoyancy compensator.
1989 Alert Diver Winter 4/1 For unknown reasons, the victim activated the power inflator on his buoyancy compensator, and left his buddies behind while he shot to the surface.
2009 St. Petersburg (Florida) Times (Nexis) 3 July 6 l By the third class, we learned how buoyancy compensators, regulators and air tanks work, then we put all the gear together and tested it in the pool's shallow end.
Draft additions September 2013
buoyancy aid n. a device or mechanism which provides added buoyancy; spec. a sleeveless jacket lined with buoyant material, esp. worn for water sports (cf. personal flotation device n. at personal adj., n., and adv. Compounds).
ΚΠ
1957 Coshocton (Ohio) Tribune 19 Aug. 9/2 Organizers of a mass channel swim..ordered Marshal Sam Rocket to inspect the..swimmers for buoyancy aids including inflatable bras.
1982 Proc. Royal Soc. B. 216 366 If the elastic bulk modulus of a buoyancy aid is less than that of water then it will become less buoyant with depth in water.
1996 Paddles Nov. 16/1 Buoyancy aids..are designed to increase a conscious swimmer's buoyancy..in a rescue situation where help is close at hand.
2013 Bristol Evening News (Nexis) 25 Feb. 18 [The kayaker] was wearing a buoyancy aid and had a radio to raise the alarm.
This entry has not yet been fully updated (first published 1888; most recently modified version published online September 2021).
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