From Wiktionary, the free dictionary
From buoyant + -cy or buoy + -ancy .
buoyancy (countable and uncountable , plural buoyancies )
( physics ) The upward force on a body immersed or partly immersed in a fluid .
The ability of an object to stay afloat in a fluid .
( by extension ) Resilience or cheerfulness .
1834 , L[etitia] E[lizabeth] L[andon] , chapter XI, in Francesca Carrara. [ … ] , volume III, London: Richard Bentley , [ … ] , (successor to Henry Colburn ), →OCLC , page 82 :With how much lighter a step, with how much brighter an eye, did Francesca wander through the forest, even in the last desolation of autumn, than she did in all the bloom and buoyancy of spring!
physics: upward force on an immersed body
Afrikaans: dryfvermoë
Arabic: طَفْو m ( ṭafw ) , طُفُوّ m ( ṭufuww )
Bulgarian: плаваемост f ( plavaemost )
Chinese:
Mandarin: 浮力 (zh) ( fúlì )
Czech: vztlak m
Danish: opdrift c
Dutch: opwaartse kracht f , drijfvermogen (nl)
Finnish: noste (fi)
French: poussée d’Archimède (fr) f , flottabilité (fr) f
Georgian: ამომგდები ძალა ( amomgdebi ʒala ) , ამწევი ძალა ( amc̣evi ʒala )
German: Auftrieb (de) m
Greek: άνωση (el) f ( ánosi ) , άντωση (el) f ( ántosi )
Hindi: उत्प्लावकता (hi) ( utplāvaktā ) , उत्प्लावन ( utplāvan )
Hungarian: felhajtó erő
Irish: buacacht f
Italian: spinta (it) f , spinta statica f , forza ascensionale f , spinta idrostatica f
Japanese: 浮力 (ja) ( furyoku )
Latin: anosa f , antosa f , buoyancia f
Macedonian: пловност f ( plovnost )
Maori: pūrewatanga
Norwegian:
Bokmål: oppdrift m or f
Nynorsk: oppdrift f
Polish: siła wyporu f
Portuguese: impulsão (pt) f , empuxo (pt)
Russian: подъёмная си́ла f ( podʺjómnaja síla ) , выта́лкивающая си́ла ( vytálkivajuščaja síla )
Serbo-Croatian:
Roman: plovnost (sh) f
Spanish: sustentación hidráulica , impulso (es)
Swedish: lyftkraft (sv) c
Thai: แรงลอยตัว ( rɛɛng-lɔɔi-dtuua )
Turkish: kaldırma kuvveti (tr)
resilience or cheerfulness