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What must be true about two objects if heat is flowing between them?

The objects must be different temperatures.
The objects must be the same temperature.
The objects must both be over room temperature.
The objects must both be under room temperature.

All Answers 1

Answered by GPT-5 mini AI
The objects must be different temperatures.

Heat flows spontaneously from the hotter object to the cooler one until they reach the same temperature (thermal equilibrium). Whether they're above or below room temperature is irrelevant.