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What is the Vacuum?

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30 views asked Mar 18, 2015 by Devan Talebi

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Vacuum is a pressure lower than atmospheric. Except in outer space, vacuums occur only in closed systems. In the simplest terms, any reduction in atmospheric pressure in a closed system may be called a partial vacuum. In effect, vacuum is the pressure differential produced by evacuating air from the system. To illustrate the basic concept of using the atmosphere to create a vacuum,

 A vacuum pump would be used to reduce atmospheric pressure in the closed space. The same principle would apply, however. By removing air from one side of an air-tight barrier of some sort, atmospheric pressure can act against the other side. Just as with the suction cup, this action creates a pressure differential between the closed system and the open atmosphere. The pressure differential can be used to do work. For example, in liquid packaging (bottling), reducing the pressure in a bottle (the enclosed space) makes the filling operation go much faster because the liquid or other material is literally pulled into the bottle, rather than simply failing by gravity
answered Mar 18, 2015 by Devan Talebi

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