A water rocket is a type of model rocket that uses water as its reaction mass. The water is forced out via a pressurized gas, typically compressed air.  These kinds of rockets are frequently constructed out of [[plastic bottle]]s, which is why these kinds of rockets are also known as "bottle rockets."

h4. See also

* [[Rocket]]

h4. External links

* "Wikipedia - Water rocket":[https://en.wikipedia.org/wiki/Water_rocket]
water rocket