The condition under which two substances in physical contact exchange no heat energy is called what?

The condition under which two substances in physical contact exchange no heat energy is called what?

• A. Thermal Equilibrium
• B. Thermal Conductivity
• C. Calorimetry
• D. Temperature Equilibrium

Answer: (A)

No heat exchange between two substances that are in contact happens when they have reached thermal equilibrium. Heat flows only when there is a temperature difference, from the hotter to the cooler object. As they interact, temperatures move closer together until they become equal, at which point there is no net heat transfer between them. That state, where no heat energy moves between the bodies, is thermal equilibrium. The term focuses on the situation of no further energy transfer due to temperature differences. In contrast, thermal conductivity describes how easily a material conducts heat, not the balance point itself; calorimetry is the measurement process for heat transfer, and temperature equilibrium is a less precise way some might phrase equal temperatures but the standard, precise term is thermal equilibrium.

No heat exchange between two substances that are in contact happens when they have reached thermal equilibrium. Heat flows only when there is a temperature difference, from the hotter to the cooler object. As they interact, temperatures move closer together until they become equal, at which point there is no net heat transfer between them. That state, where no heat energy moves between the bodies, is thermal equilibrium. The term focuses on the situation of no further energy transfer due to temperature differences. In contrast, thermal conductivity describes how easily a material conducts heat, not the balance point itself; calorimetry is the measurement process for heat transfer, and temperature equilibrium is a less precise way some might phrase equal temperatures but the standard, precise term is thermal equilibrium.