Question

give an example which illustrate the 2nd law of thermodynamics​

Answer 1

Explanation:

The second law states that there exists a useful state variable called entropy S. The change in entropy delta S is equal to the heat transfer delta Q divided by the temperature T. An example of a reversible process is ideally forcing a flow through a constricted pipe. Ideal means no boundary layer losses.

Answer 2

A hot object is put in contact with a cold object. Eventually, they both achieve the same equilibrium temperature.