Why does ice at 0°C feel colder than water at 0°C?
Answer: Removal of 40 calories of heat from 1 gram of water at 0°C produces 1 gram of ice at 0°C. So, 1 gram of ice at 0°C contains 80 calories less heat than 1 gram of water at 0°C. So 1 gram of ice at 0°C feels colder than 1 gram of water at 0°C.