noun
the ability or tendency of something to float in water or air
adjective
buoyant
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The buoyancy of the ship was carefully calculated to ensure it could float properly.
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I love how the buoyancy of the pool float keeps me afloat in the water.
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Dude, your positivity is like the buoyancy that keeps us afloat in this tough situation.
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Her buoyancy in the face of adversity is truly inspiring.