Mechanical Engineering - Thermodynamics - Discussion

Thermodynamics System is a definite macroscopic region or Space in the universe in which one or more thermodynamic processes take place.

Thermodynamics System are generally 3 types,
1. Open System.
2. Close System.
3. Isolated System.

When the gas kept in a vessel is heated, the gas rises up in the container to expand, and when it stops heating, the gas returns to its old state, again when heating, Then the gas rises again to expand, comes back to its state after stopping heating. Thus it proves that this is a thermal cycle, not a thermodynamics process.

It's called "thermodynamics process".

It is a thermodynamic process.

Because in the cycle the system has to return to the initial state. Consider that heat is added at constant volume now to expand the same gas volume gas to increase so the final state is not reached hence it is not cycled. Therefore, it is just a series of the process most acceptable another process, not a cycle. It is a thermodynamic process.