Can heat energy exist below 0 degrees C?

• A. Yes
• B. No
• C. Only at high pressure
• D. Only in solids

Answer: (A)

Heat energy is the total energy stored in a substance due to the motion and interactions of its molecules, while temperature is a measure of the average kinetic energy of those molecules. A substance can have heat energy even when its temperature is below freezing. For example, ice at -10°C contains thermal energy in its molecular motions and bonds. If you add heat, that energy increases the temperature toward 0°C and can eventually cause melting. So, lower temperatures do not mean there is no heat energy present; heat energy can exist below 0°C.