Chemical thrusters are propulsion systems that generate thrust by burning propellant, typically a combination of fuel and an oxidizer. This combustion produces high-pressure gases that are expelled through a nozzle, creating a force that propels a spacecraft in the opposite direction, according to Newton's third law of motion. These thrusters are commonly used in space missions for maneuvers such as orbit adjustments and attitude control. They are found in various spacecraft, including satellites and crewed vehicles like the Space Shuttle. Chemical thrusters are known for their reliability and relatively high thrust-to-weight ratio.