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# buoyancy

noun (buoyancy — uncountable)

«buoyancy» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. (science) The upward push that water (or air) gives to an object, which makes things float or feel lighter. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#m1)
2. The ability of something to float: «Cork has great buoyancy.» [tree →](https://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://mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#m3)
4. (money) When prices or business stay high and strong. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/#m4)

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

## On Mova

- [Trees and pragmatics of «buoyancy» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/B/buoyancy/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«buoyancy» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/buoyancy.html) on Mova free.