In rocket engine
* The combustion chamber in a rocket engine is directly analogous to the reservoir of a supersonic wind tunnel
* The stagnation conditions exist at the combustion chamber
* The exit velocities of exhaust gases are much higher that those in jet engine

Gas turbine as compared to internal combustion engine
* Can be driven at a high speed
* Produces uniform torque
* Has more efficiency

Classification of thermodynamic systems are

1. Closed system: Closed system is one in which boundary of the system does not allow the matter (mass) to cross it, then it is known as closed system. Here the system contains fixed or constant amount of matter (mass). Energy can cross the boundary. Heat and work are the only ways in which energy can be transferred between a closed system and its surroundings. Refrigerator is an example of Closed system.

2. Open system: Open system is one in which boundary of the system allows the matter (mass) to flow into or out of the system, then it is known as open system. In open system matter (Mass) crosses the boundary of the system. Heat and work may also cross the boundary.

3. Isolated system: Isolated system is one in which boundary of the system does not allow the matter (mass) or the energy to flow into or out of the system, then it is known as isolated system. An isolated system in one which is completely uninfluenced by the surroundings. It is of fixed mass and no heat or work crosses the boundary of the system.