Propellant refers to any substance that can produce thrust through a chemical reaction or physical process, typically by expelling mass. It is commonly used in rockets, vehicles, and various propulsion systems. Propellants are classified into two main categories: 1. **Chemical Propellants**: These involve the combustion of fuels and oxidizers to produce hot gases that are expelled to generate thrust. Common examples include: - Liquid propellants (e.g.
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