Definition

Noun: 1. A method of propulsion for vehicles, especially spacecraft, that generates thrust by expelling mass rearward at high speed, typically through the combustion of propellants. This form of reaction propulsion carries its own oxidizer, allowing it to operate in environments without atmospheric oxygen, such as in space. 2. The technology and physical principles involved in accelerating a rocket. It is based on Newton's third law of motion: for every action, there is an equal and opposite reaction.

Usage Examples

• The success of the satellite launch depended entirely on the efficiency of its rocket propulsion.
• Engineers are researching new fuels to improve rocket propulsion systems for deep-space missions.
• The course covers the fundamental principles of rocket propulsion.

Advanced Usage

• "Liquid rocket propulsion": A system that uses liquid propellants (fuel and oxidizer), offering controllability and high performance.
  • Most large launch vehicles rely on liquid rocket propulsion for their main engines.
• "Electric rocket propulsion": A method that uses electrical power to accelerate propellant ions to generate thrust, often used for precise station-keeping of satellites.
  • The probe used electric rocket propulsion for its long journey to the outer planets.

Variants and Related Words

• Rocket engine (n): The specific device that produces thrust via rocket propulsion.
  • The spacecraft's main rocket engine fired for six minutes.
• Propulsion (n): The general act or process of driving something forward.
  • The jet's propulsion system was inspected before the flight.
• Thrust (n): The force produced by a propulsion system.
  • The rocket's thrust must exceed its weight to lift off.

Synonyms

• Reaction propulsion: A broader term for any propulsion system that works by expelling reaction mass.
• Jet propulsion (in a vacuum context): While often associated with air-breathing engines, in the context of space, it can be used loosely for systems expelling mass.

Related Phrases

• To achieve propulsion: To successfully generate forward motion.
  • The design must efficiently achieve propulsion with minimal fuel.
• Propulsion system: The complete assembly of components used to propel a vehicle.
  • A failure in the propulsion system forced the mission to be aborted.

Noun

1. reaction propulsion using stored oxygen for combustion; used where there is insufficient atmospheric oxygen