Heat flows from hot to cold.

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Multiple Choice

Heat flows from hot to cold.

Explanation:
Heat flows from hot to cold because temperature difference drives energy transfer. The hotter object has higher average kinetic energy, so when it interacts with the cooler object, energy moves from the more energetic particles to the less energetic ones. This transfer continues until both objects reach the same temperature (thermal equilibrium). So the statement that heat flows from hot to cold is the natural, spontaneous direction. The reverse flow happens only if external work is applied (as in refrigerators) or if there is no temperature difference, in which case there is no net transfer.

Heat flows from hot to cold because temperature difference drives energy transfer. The hotter object has higher average kinetic energy, so when it interacts with the cooler object, energy moves from the more energetic particles to the less energetic ones. This transfer continues until both objects reach the same temperature (thermal equilibrium). So the statement that heat flows from hot to cold is the natural, spontaneous direction. The reverse flow happens only if external work is applied (as in refrigerators) or if there is no temperature difference, in which case there is no net transfer.

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