The plural form of buoyancy, referring to multiple instances of the ability to float or remain suspended in a fluid.
From buoyant + -cy (a noun suffix creating abstract nouns), with the plural -ies. Buoyancy is the more common modern form; buoyancies is the older or more specialized plural.
In deep-sea research, scientists talk about 'buoyancies' because different organisms achieve floating differently—some use gas, some use low-density tissues, some use chemical gradients—so the plural term captures this diversity of mechanisms.
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