Is it a vacuum or vacum, correct spelling is vacuum with double u, not vacum with single u. The word vacuum comes from Latin vacuus meaning empty, and standard English spelling retains double u, with pronunciation vak-yoom. Common misspelling vacum with one u is incorrect and often results from typing error because double u is unusual in English. Plural is vacuums or vacua for scientific usage. When referring to appliance, correct is vacuum cleaner, not vacum cleaner. So always spell vacuum with two u letters after v, pattern v a c u u m. If you write vacum, spellchecker will mark as error. For abbreviation, informal short form vac is acceptable in casual speech, but full word must be vacuum. So answer is it is vacuum, not vacum, remember double u to be correct in writing.
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