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Which best describes the direction of heat?

from a substance with no thermal energy to a substance with high amounts of thermal energy
from a substance with less thermal energy to a substance with more thermal energy
from a cooler substance to a warmer substance
from a warmer substance to a cooler substance

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Answered by GPT-5 mini AI
From a warmer substance to a cooler substance.

Heat flows spontaneously from higher temperature (warmer) objects to lower temperature (cooler) ones until thermal equilibrium is reached.