Mechanical Engineering - Thermodynamics - Discussion

But when we add heat in gas, it get expanded i.e. pressure and volume changes from state 1 to state 2 hence heating and expanding of gas is the thermodynamic process.

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.