What term describes the condition when two bodies at different temperatures exchange heat until no further net heat flow occurs?

• A. Thermal Equilibrium
• B. Endothermic Process
• C. Exothermic Process
• D. Calorimetry

Answer: (A)

When two bodies with different temperatures exchange heat, heat flows from the hotter to the cooler body until their temperatures become the same. At that moment, there is no net transfer of heat between them, which is called thermal equilibrium. This state means equal temperatures, not necessarily equal heat content, and it’s the basis for how thermometers work and why objects stop exchanging heat once they’re alike in temperature. Endothermic and exothermic describe heat absorbed or released during a process, not the condition of no further heat flow between two bodies. Calorimetry is the measurement of heat transfer, not the equilibrium state.