A plastic bottle with "rocket wings" contains about half a litre of water. By using a pump, a pressure of approximately 2 bar is created inside the bottle. The valve opens and the water is abruptly forced out, propelling the rocket 30 metres into the air!
How does it work?)
The water is forced out the bottle because of the high pressure inside. It can actually be viewed as if the rocket pushes itself out of the water. This rebound effect would be insignificant if pressurised air was used instead of water, as the propulsion from air would be very small. In this instance, the rocket would only reach between 1 and 2 metres high.
The water rocket is also available in our shop:
www.physikantenshop.de
