The first law of thermodynamics states that energy cannot be created or destroyed, only converted from one form to another. The second law of thermodynamics states that the total entropy of a closed system will always increase over time.

The thermodynamics of propulsion involve the study of the relationship between heat, work, and energy. In the context of propulsion systems, thermodynamics is used to analyze the energy conversion process, including the combustion of fuel, the expansion of gases, and the generation of thrust.

Propulsion systems are designed to generate thrust, which is the forward force that propels a vehicle or an object through a fluid, such as air or water. The primary components of a propulsion system include a power source, a transmission system, and a propulsor. The power source can be a chemical reaction, such as combustion, or an electrical energy source. The transmission system transmits the energy from the power source to the propulsor, which converts the energy into a forward force.