Whenever you are pointing to a rocket engine chances are that what you are actually seeing is the exhaust nozzle of the rocket engine. Almost all rocket engines have a bell-shaped exhaust nozzle , known as a bell nozzle. The nozzle of a rocket engine performs a very important function of directing hot, high-pressure, and temperature gases in one direction to get reaction force (Newton's 3 rd Law of Motion) in the opposite direction. Image credit: NASA Apart from Bell-nozzle engineers have also tried a different type of nozzle known as Aerospike Nozzle . Although this concept was never implemented on a real rocket, in 1997 NASA tested this nozzle on SR-71 aircraft . The purpose of an exhaust nozzle is to decrease the pressure of gas up to the local atmospheric pressure and increase the velocity of exhaust gases. The higher the velocity of exhaust gases more the thrust produced by the rocket engine. Rocket engines have extremely high chamber pressure (as high as 270 bar)...
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