Difference between air and vacuum???

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Solution

The difference between air and vacuum is the presence of the particles of Oxygen, Hydrogen, Nitrogen and Ozone.The idea that a vacuum is the total absence of air is a common mistake! True, such a situation would be a very good one, but in practice it's not really achievable. Even in outer space there are still some particles 'kicking around'. No, a vacuum is any containment where the pressure is below local atmospheric pressure.

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