How does a solid propellant rocket work?

A solid propellant rocket works by using a fuel and oxidizer that are chemically mixed and solidified into a single mass, known as solid propellant. When ignited, the combustion of this propellant produces high-pressure gas that expands rapidly. This gas is expelled through a nozzle at the rear of the rocket, generating thrust according to Newton's third law of motion. As the propellant burns, the rocket continues to accelerate until the fuel is depleted.