What is the most accurate statement concerning the second law of thermodynamics?

Question

What is the most accurate statement concerning the second law of thermodynamics? The Carnot cycle involves an isothermal expansion followed by an isobaric compression. The efficiency of this partial cycle is normally about 96%. The second law of thermodynamics requires heat to flow spontaneously from a cooler object to a warmer object. This is the basis for a refrigerator. A closed thermodynamic system absorbs heat at a high temperature and then converts the heat absorbed into useful work at a lower temperature. An isothermal process requires the temperature and pressure in a closed thermodynamic system to remain constant. No cyclic thermodynamic process can convert heat completely into mechanical work.

Explanation / Answer

'Entropy increases in an isolated unstable system over time.'

The best and most accurate way of explaining and understanding the 2nd Law is through entropy and the above statement does the job.

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