Uncountable (mass) nouns refer to substances, concepts,or general terms for classes of items. The following words are uncountablenouns: oxygen (substance), education (concept),equipment (general term).
Do not use an article with an uncountable noun ifyou are referring to the noun in a general sense.
Marie and Pierre Curie discovered the radioactivity in1898.
Marie and Pierre Curie discovered radioactivity in 1898.
Copyright ©2001 The McGraw-Hill Companies. Any use is subject to the Terms of Use and Privacy Policy. McGraw-Hill Higher Education is one of the many fine businesses of
The McGraw-Hill Companies, Inc..
