Vacuum Tube
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Why do a coin and a feather in a vacuum tube fall with the same acceleration?
In a vacuum situation there is no air to be a barrier for any object. Air particles contain various gasses including but not limited to Oxygen, Hydrogen, CO2 and more. Each gas particle in the air have different weight and causes disruption of movement in other objects.
The earth atmosphere also contains barriers, for example, the Ozone layer is at the top because this type of gas is lighter then other particles.
If your question is regarding a home vacuum cleaner, then it is a different scenario. A home vacuum cleaner is not really a vacuum, because there is an air flow from one point to the other. The air suction is strong ernough that you won't notice the suction difference between a metal object and a feather.
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