Plural form of helium; multiple quantities or types of helium, or a poetic/technical reference to helium atoms or samples.
From 'helium' + regular English plural '-s'. While helium is typically uncountable, the plural appears in technical scientific contexts.
Though we usually say 'helium' as a mass noun like 'water,' scientists sometimes use 'heliums' when discussing isotopes (helium-3 and helium-4 are two different 'heliums').
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