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t will work if only half the tube is filled so a column of air will be trapped between both ends. As the gasoline in the tube flows out of the tube, it pulls the column of air between gasoline and the other end inserted into the tank creating a suction effect. The empty barrel has to be lower because as gasoline inside the tank is drawn into the tube, gravity has to take over to make the gasoline flow downward.

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Q: When a mechanic wants to empty the gasoline tank of a car he fills a plastic tube with gasoline dips one end of the tube into the gasoline in the tank and puts the others why does this technique work?
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