when a mechanic wants to empty the gasoline tank of a car he feels a plastic tube with gasoline and deep end of the tube into the top hidden tooth the other end into an empty container which is much lower than the car tank why does it technique work??
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Answer:
OK well first of all the tube has to be lower than the tank for this to work but anyway gravity pulls out the gasoline from the tube into a bucket or can or whatever, and this creates a vacuum which needs to be filled with something, because the other end is submerged in gasoline that is what fills the vacuum, this is a continuous effect until there is nothing with an appropriate mass to fill the void (e.g air)