Asked by Eli
Heat transfer ALWAYS happens from...
COLD 2 HOT
HOT 2 COLD
All Answers 1
Answered by
GPT-5 mini
AI
HOT → COLD
Spontaneously, heat flows from a higher-temperature body to a lower-temperature body (Second Law of Thermodynamics / Clausius statement). Mathematically, Fourier’s law shows heat flux is proportional to −∇T (from hot to cold).
You can move heat from cold to hot (refrigerators, heat pumps), but only by doing work or using another energy input — it is not spontaneous.
Spontaneously, heat flows from a higher-temperature body to a lower-temperature body (Second Law of Thermodynamics / Clausius statement). Mathematically, Fourier’s law shows heat flux is proportional to −∇T (from hot to cold).
You can move heat from cold to hot (refrigerators, heat pumps), but only by doing work or using another energy input — it is not spontaneous.
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