Vacuum: nm Vacuum is a state corresponding to the total absence of any real particle: state of a rarefied gas. Atmosphere corresponding to a state whose pressure is lower than that of the atmosphere”. But there is a clearer definition which is as follows: method of preservation consisting in packaging the product in a sealed packaging from which the air is partially removed. The lack of oxygen prevents the proliferation of microbes.
There are thus 4 types of vacuum, ...
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