Plural form of alkalinity; multiple instances, degrees, or measurements of the alkaline property of different substances.
From 'alkalinity' (alkali + Latin '-inity' for quality) + plural '-ies.' The ability to pluralize abstract properties reflects English's flexibility for discussing multiple instances of qualities.
Chemists use plurals like 'alkalinities' to compare different solutions—'the alkalinities of these five samples'—letting them discuss multiple levels of the same property simultaneously, a useful scientific tool.
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