Is 'vacuum' a countable noun?
A vacuum cleaner actually uses such features of a vacuum created by a fan on the inside.
understand the first indefinite article 'a' is for the vacuum cleaner. what about the other one after 'of' - a vacuum created -
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I'm not familiar with the term 'countable noun' but 'a vacuum' is a legitimate clause in an English sentence. The second 'vacuum' in the sentence is a noun. Google dictionary for English shows a vacuum is 'a space entirely devoid of matter.'
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