Which thermodynamic law says that you cannot convert 100 percent of a heat source into mechanical energy?

Question

Quizplus · Accepted Answer

The second law of thermodynamics states that it is impossible to convert 100% of a heat source into mechanical energy without any loss in the form of heat. This law is also known as the law of entropy. The first law of thermodynamics is the conservation of energy law while the third law of thermodynamics deals with the behavior of a system at absolute zero temperature. The law of increasing entropy is a general consequence of the second law of thermodynamics.

Which Thermodynamic Law Says That You Cannot Convert 100 Percent