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The science behind the water rocketvery simple. After a third of the rocket is filled with water, air is pumped inside with the help of a bicycle pump. The structure is sealed from all sides. Due to the fact that the air pressure inside the rocket increases, when the rocket is launched, the compressed air tries to quickly return to normal atmospheric pressure, but its path is blocked by water. Thus, the air pushes the water out.
This is where Newtonian physics comes to the rescue.When air acts on water, it exerts an equal and opposite force on the air. Since the rocket is made of plastic, which weighs less water, the force on the rocket propels it. The speed of the rocket depends on the compressed air pressure before launch.
It is very easy to build such a rocket. In addition to the large plastic bottles, you will need a lot of duct tape, a wine bottle stopper, a small piece of cardboard, and an old umbrella.
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