What is vacuum?
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Vacuum is an empty space where air is absent.
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vishjaiswal:
Vacuum is space devoid of matter. The word stems from the Latin adjective vacuus for "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure. ... Much higher-quality vacuums are possible.
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Explanation:
Vacuum is the empty space where the presence of air is present ..! It is mainly observed in the universe ...! In such medium sound is unable to propagate ....!
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