Can a pump create vacuum?
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The principle behind positive displacement vacuum pump is create a vacuum by expanding the volume of a container. For example in a manual water pump, a mechanism expands a small sealed cavity to create a deep vacuum. Because of the pressure, some fluid from the chamber is pushed into the pump's small cavity.
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A device that can induce pressure difference between two regions of space is considered a pump. In a certain system, the pump that creates a vacuum is considered a vacuum pump. There are two types of vacuum pumps, one being a transfer pump and the other being a trapping pump.
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