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# buoyancy

«buoyancy» in Mova's school dictionary: **The upward push that water (or air) gives to an object…** — its meaning for a pupil, its sense in the lessons and examples.

### part of speech

noun (buoyancy — uncountable)

### meaning for a pupil

1) (science) The upward push that water (or air) gives to an object, which makes things float or feel lighter. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#m1)

2) The ability of something to float: «Cork has great buoyancy.» [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#m2)

3) Cheerfulness and the ability to recover quickly from bad times: «her buoyancy of spirit». [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#m3)

4) (money) When prices or business stay high and strong. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#m4)

### sense in the lessons

In science lessons buoyancy explains why boats float and stones sink: an object floats if the upthrust of the water is as big as its weight. Salty water gives more buoyancy, so floating in the sea is easier than in a pool. Swimmers use buoyancy aids (armbands, floats). Related: upthrust, float, sink, density.

### examples

- Buoyancy keeps the boat afloat. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#x1)
- A life jacket gives you buoyancy in the water. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#x2)
- It is easier to float in the sea because salt water gives more buoyancy. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#x3)
- We tested the buoyancy of different fruits: the orange floated. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#x4)
- Submarines change their buoyancy to dive and rise. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#x5)
- Despite losing the match, the team's buoyancy returned quickly. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#x6)
- The buoyancy of the air made his heart light. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#x7)

### note

Say «BOY-un-see» (UK) or «BOO-yun-see» (US). Spelling trap: «buoy» comes first (u before o). Adjective: buoyant. Myth: heavy things can float if their shape pushes away enough water — a steel ship floats.

### Trees and pragmatics

[Every meaning and example of «buoyancy» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/), each sentence with its dependency tree and frames.