Learn how to say Buoyancy correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word buoyancy:
1the ability or tendency of something to float in water or other fluid.
the power of a liquid to keep something afloat:
she plunged into the sea, grateful for the buoyancy of the salt water
2a cheerful and optimistic attitude or disposition.
3a high level of activity in an economy or stock market:
there is renewed buoyancy in the demand for steel