Question

According to _______ , heat flows naturally from a hot object to a cold object but will not flow spontaneously from a cold object to a hot object.

Answer 1

It is important to emphasize that this statement of the 2nd law applies to the spontaneous flow of heat from hot to cold. It is possible, of course, to make a cool object in a warm place cooler - this is what a refrigerator does - but this involves the input of some external energy. As such, the flow of heat is not spontaneous in this .