However, since then the usage of rockets have been diversified. Nowadays, rockets are used from as small as model rocketry for hobbyist to as large as a satellite launcher. Another diversified usages of rockets is as a launch vehicle for cloud seeding. In line with this, over the past decade Universiti Teknologi Malaysia UTM has been developing capabilities to launch a small rocket. Due to the low cost of raw materials and ease of production process, composite propellant is the best choice for this purpose.
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A rocket engine uses stored rocket propellants as reaction mass for forming a high-speed propulsive jet of fluid, usually high-temperature gas. Rocket engines are reaction engines , producing thrust in accordance with Newton's third law. Most rocket engines use the combustion of reactive chemicals to supply the necessary energy, but non-combusting forms such as cold gas thrusters and nuclear thermal rockets also exist. Vehicles propelled by rocket engines are commonly called rockets. Rocket vehicles carry their own oxidizer , unlike most combustion engines, so rocket engines can be used in a vacuum to propel spacecraft and ballistic missiles.