second law of thermodynamics

Second law of thermodynamics :  The law specifying the condition of transformation of heat into work is called the Second law of thermodynamics.

There are several statements which explains the second law of thermodynamics ------

1) Kelvin-Planck's statement : It is impossible to construct an engine, operating in a cycle, to extract heat from hot body and convert it completely into mechanical work done i.e., 100% conversion of heat into work is impossible.

2) Clausius statement : It is impossible for any cyclic machine to produce no any effect other than to convey heat continuously from one body to another at a higher temperature.

3) Kelvin's statement : It is impossible to get continuously supply of work by cooling a body to a temperature lower than that of the coldest of its surroundings.

                                                  

                                                                                                              https://youtu.be/UCHIvvAvekA