Reference Terms
from Wikipedia, the free encyclopedia


A propellant is a material that is used to move an object by applying a motive force.

This may or may not involve a chemical reaction.

It may be a gas, liquid, plasma, or, before the chemical reaction, a solid.

Common chemical propellants consist of a fuel, like gasoline, jet fuel and rocket fuel, and an oxidizer.

In aerosol spray cans, the propellant is simply a pressurized vapour in equilibrium with its liquid.

As some gas escapes to expel the payload, more liquid evaporates, maintaining an even pressure.

Note:   The above text is excerpted from the Wikipedia article "Propellant", which has been released under the GNU Free Documentation License.
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