Hot water rocket
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A hot water rocket (also steam pressure rocket) is a water rocket in which the water in the rocket is heated up to a high temperature (approx. 250-500 °C). Due to the pressure in the closed water tank (see steam pressure table), at launch the water is ejected by the thrust nozzle, which is equipped with a valve. In the nozzle the water turns into vapour, leaving the nozzle with high speed. By the recoil the rocket accelerates against the direction of the steam. The water tank of hot water rockets must be able to withstand high pressure and high temperature.
Hot water rockets are used occasionally as auxiliary launch aids and for experimentation purposes.[citation needed] They are more powerful than standard water rockets, since the discharged mass contains the energy and the thrust remains almost constant up to "burnout". The efficiency of rockets with solid and liquid fuels is, however, much higher.
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