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Question:

Inside all vacuum cleaners is a high-speed fan.?

Explain how this fan causes dirt to be picked up by the vacuum cleaner.

Answer:

When the fan spins, it creates a region of lower than atmospheric pressure behind it and higher pressure ahead of it. The region of lower pressure is open to the area you are cleaning. This reduced pressure causes air (and hopefully what you are trying to pickup) to be pulling into the vacuum and passes through the fan and into bag or bin.
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