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The Mayfield Handbook of Technical & Scientific Writing
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Uncountable (Mass) Nouns

Uncountable (mass) nouns refer to substances, concepts, or general terms for classes of items. The following words are uncountable nouns: oxygen (substance), education (concept), equipment (general term).

Do not use an article with an uncountable noun if you are referring to the noun in a general sense.


Marie and Pierre Curie discovered the radioactivity in 1898.


Marie and Pierre Curie discovered radioactivity in 1898.

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## Uncountable (Mass) Nouns ##
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