Chemical propulsion is a methodological approach and research field focused on generating thrust by harnessing the energy released from controlled chemical reactions. This domain investigates the principles, design, performance, and optimization of propulsion systems that convert the chemical energy of propellants into kinetic energy of an expelled mass, typically hot gas, via processes such as combustion or decomposition. Key areas of study include propellant formulation, reaction kinetics, combustion chamber design, nozzle thermodynamics, and system integration, which are critical for applications ranging from atmospheric flight to space exploration.