The noun "air" can be both countable and uncountable.
air → uncountable
Meaning: the mixture of gases surrounding the earth
Example sentence: The air in the mountains is very fresh.
air → countable
Meaning: (old-fashioned) a tune or a melody
Example sentence: Have you ever heard Bach's Air on a G String?
In which sentence is the word "air" uncountable?
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Contributor: Matt Errey