Heat flows from warmer substance to a cooler substance.

Heat flows from warmer substance to a cooler substance.

• A. False
• B. True
• C. Only in solids
• D. Never

Answer: (B)

Heat transfer moves along a temperature gradient—from the warmer substance to the cooler one—until both reach the same temperature. This happens because the hotter object has more energy that can be shared with the cooler one, so energy flows spontaneously to even out the temperatures. Heat can move by conduction through solids, by convection in liquids and gases, and by radiation through space, so the transfer isn’t limited to solids. Because of this natural direction of energy flow, the statement is true.

Heat transfer moves along a temperature gradient—from the warmer substance to the cooler one—until both reach the same temperature. This happens because the hotter object has more energy that can be shared with the cooler one, so energy flows spontaneously to even out the temperatures. Heat can move by conduction through solids, by convection in liquids and gases, and by radiation through space, so the transfer isn’t limited to solids. Because of this natural direction of energy flow, the statement is true.