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Buoyancy

ˈbɔɪən(t)si

Buoyancy definitions
noun
buoyancy
  1. the ability or tendency of something to float in water or other fluid
    ability to float tendency to float lightness
    • the power of a liquid to keep something afloat

      "she plunged into the sea, grateful for the buoyancy of the salt water"

  2. a cheerful and optimistic attitude or disposition
  3. a high level of activity in an economy or stock market

    "there is renewed buoyancy in the demand for steel"