Write Kelvin-Planck statement for second law of thermodynamics.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Concept**: The second law of thermodynamics deals with the direction of heat transfer and the efficiency of heat engines. It states that not all heat energy can be converted into work.

2. **Defining the Kelvin-Planck Statement**: The Kelvin-Planck statement specifically addresses the limitations of heat engines. It states that:
- "It is impossible for any device that operates on a cyclic process to receive heat from a single reservoir and convert all of that heat into work."

3. **Implications of the Statement**: This means that when a heat engine operates, it must reject some heat to a lower temperature reservoir. Therefore, the efficiency of a heat engine, defined as the ratio of work output to heat input, cannot be 100%.
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