Heat transfer follows the second law of thermodynamics by flowing from hotter objects to cooler ones.
The second law of thermodynamics states that heat transfer flows from a hotter to a cooler object, never the reverse. When two objects of different temperatures are in contact, heat will flow from the higher-temperature object to the lower-temperature object.
For example, if a hot object and a cold object are in contact, heat will always move from the hot object to the cold one until they reach thermal equilibrium.
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