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Usually, a combustible substance that produces heat and supplies ejection particles, as in a rocket engine. A propellant is both a source of energy...

Propellants (in 'Ion propulsion' article)
Ion-thruster propellants are selected according to performance, technical suitability, availability, cost, and storage characteristics. For geospace t

Propellants (in 'Plasma propulsion' article)
Plasma acceleration allows a wider choice of propellants than any other type of propulsion. Plasma-propelled spacecrafts thus have the potential of us

Gelling propellants (in 'Propellant modification' update)
Gelling is a way of increasing the viscosity or thickness of a liquid propellant. A shear-thinning liquid is a desirable choice for the gelled fuel co

Studies of gelled propellants (in 'Propellant modification' update)
Metallized gelled rocket propellants have been considered for many different applications. Numerous studies have shown the potential benefits of gelle

Liquid-propellant rocket engines (in 'Rocket propulsion' article)
These use liquid propellants stored in the vehicle for their chemical combustion energy. The principal hardware subsystems are one or more thrust cha

Solid-propellant rocket motors (in 'Rocket propulsion' article)
In rocket motors the propellant is a solid material that feels like a soft plastic or soap. The solid propellant cake or body is known as the grain.

Liquid propellants (in 'Rocket propulsion' article)
Table 5 lists several common liquid propellants. Bipropellants have a separate oxidizer liquid (such as liquefied oxygen or nitrogen tetroxide) and a

Solid propellants (in 'Rocket propulsion' article)
Of the many different solid propellants, the three most common types are composite propellants, double-base propellants, and composite double-base pro

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