What is the principle of using a water spray gun

There is a switch inside the water gun that controls the operation of the air pump. As soon as the air pump works, compressed air will siphon water out. It adopts the principle of siphoning. During operation, the air pump squeezes water into a thin pipe and then sprays it out from the nozzle of the water gun. By adjusting the nozzle, the flowing water can be adjusted to a concentrated flow.