When a mechanic wants to empty a gasoline tank of a car,he fills a plastic tube with...

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Kei x]]

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...gasoline.....? When a mechanic wants to empty a 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 one end at a empty drum lower than the gasoline tank of the car.Why does this technique work?
 
It is called siphoning. It is where a liquid will always travel to the lowest point, when and only when, no air is present. This is the reason the pipe is filled with gas before putting it into the tank.
 
gravity and suction! the tube that is full of petrol wants to empty it's self into the lower empty tank which creates suction on the upper tank (as long as one end is in petrol) and gravity is always pulling the liquid or petrol towards the lower tank! Hope this helps
 
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