Rosa pours a cup of boiling water into a pot of room-temperature water. According to the second law of thermodynamics, what will occur?

Heat flows spontaneously from a hotter object to a cooler one, so thermal energy moves from the boiling water to the room-temperature water. This transfer continues until the water reaches thermal equilibrium, meaning all of it is at a single temperature. The energy does not continue flowing once the temperatures are equal.

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