Production principle: Because the forces are mutual, water rockets use the action and reaction of compressed air and water. When water is ejected backward, the air in the bottle is forced to rush forward. This principle is used to launch water rockets.

Water rocket is a toy designed by using mass ratio and air pressure, and it is also one of the famous cases in physics teaching. It can cultivate students' interest in learning physics, and the physical principles contained in it are an important basis for understanding mechanics in physics.

When launching, make sure that the rocket is straight and consistent with the orbit. If it deviates from 1 ~ 2 degrees, it will affect the flight stability and fly in the shape of "8" When pumping air, it should be as smooth as possible, and the pumping frequency should be fast, not too slow. In order to tighten the air plug as much as possible, it can be adjusted by tightening the screw of the air plug. The tighter the air plug, the greater the air pressure in the bottle, and the greater the power of the rocket.