Fact: Even now, many people still think that gasoline flows through this small hole
Explanation:
At the end of the gasoline pump nozzle, there is a small hole with a diameter of a few millimeters. This is a tube that leads straight to a relay inside the nozzle. Imagine that when you pump liquid into a container, the liquid pushes the air inside the container out. The same happens when pouring gasoline; as the gasoline flows into the tank, it pushes the air inside the tank out into the environment. This amount of air will enter the small 1 cm tube.
When the tank is full, there is no more air to enter the small tube, causing a change in pressure within the tube. At this point, the relay inside the nozzle detects that the tank is nearly full and closes the valve to stop the flow of gasoline, preventing the tank from overflowing.
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