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Originally Posted by lineslinger
I am talking about suction, not vacuum. I shouldn't have used the word vacuum earlier.
Suction occurs when a low pressure area is created in relation to ambient pressure.
The piston drops faster than the ambient pressure can displace the low pressure area created.
Suction.
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Suction is the creation of a partial vacuum, or region of low pressure. The pressure gradient between this region and the ambient pressure will propel matter toward the low pressure area. Physicists consider the notion of "suction" to be specious, since vacuums do not innately attract matter.
Dust being "sucked" into a vacuum cleaner is actually being pushed in by the higher pressure air on the outside of the cleaner.
Higher pressure of surrounding air can push matter into a vacuum but a vacuum cannot attract matter
This is all just a matter of physics.
# 3 is the correct answer. No matter what you think just except it.
