Rocket fuel

In most rockets using solid or liquid fuel is burned in a closed space, and the resulting gases released through one or more nozzles of relatively small diameter. The necessary combustion oxygen can be obtained from chemical compounds, for example potassium nitrate. In modern rocket engines, liquid oxygen is commonly used for burning such fuels as kerosene, liquid hydrogen or hydrazine (nitrogen-hydrogen compound).
Rocket engine solid fuel (SRM) are widely used due to its simplicity and reliability. They are installed on most military missiles are some boosters of space vehicles and sometimes as the engine parts of multi-stage rockets. However, for complex space missions give preference to LRE because they create thrust is easily adjustable. In addition, for the same weight of fuel a rocket engine provide more thrust and acceleration than solid propellant motors.