Kelvin-Planck statement
= Kelvin-Planck statement
{c}
No cyclic device can have as its sole effect the extraction of <heat> from one reservoir and its complete conversion into <work>. If the reservoir loses heat $Q>0$ at <temperature> $T$, its <entropy> change is $-Q/T$ while the cyclic device returns to its starting state. A sole-effect conversion would therefore reduce total entropy.