Question

Which way can heat never flow?

Responses

hot to cold

hot to cold

solid to liquid

solid to liquid

liquid to solid

liquid to solid

cold to hot

Answer 1

Heat can never flow spontaneously from cold to hot. This is a fundamental principle of thermodynamics, specifically the second law of thermodynamics, which states that heat naturally flows from a region of higher temperature (hot) to a region of lower temperature (cold).