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A vacuum is a place where there is no matter. Sound cannot move in a vacuum. Outer space is not a perfect vacuum, because there is a very small number of particles there. A vacuum cleaner is a device that cleans dirt from floors. Sometimes it is just called a vacuum. Vacuum chambers are also used in many physics experiments involving environments with no matter.
Vacuum is needed for industrial production. Vacuum pumps are used to pump air out of the chamber. After the process is finished, no air is in the chamber (only vacuum is present). In the real world it is not possible to create 100% vacuum, but the latest vacuum pumps are able to create 99.9999% vacuum. For most industrial purposes, vacuum is used vacuum up to 0.001%. Lower vacuum is mainly used for laboratory purposes.
Industrial vacuum is mainly used in:
- Food industry
- Electronics industry
- Coating and degasing