Introduction


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Background (continued)
The word propulsion is derived from the Latin words pro meaning before or forwards and pellere meaning to drive. Therefore propulsion means to drive or move an object forward. (Benson)
Propellants provide the thrust for the rockets. There are two kinds of propellant: solid and liquid. All propellants have a fuel and an oxidizer (oxygen). The most common fuel is either hydrogen or kerosene. The fuel and the oxidizer explode in the combustion chamber and produce a hot jet of gas that shoots out of the nozzle of the rocket. The rate at which the exhaust comes out of the nozzle of the rocket is called the exhaust velocity. This provides the thrust for the rocket to move upward. The exhaust velocity can change depending on the size of the nozzle of the rocket. (Lobbia)

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