question_answer

  Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.                    [NCERT Exempla]  

Answer:

               In case of ice, the water molecules have low energy while in case of steam the water molecules have high energy. The high energy of water molecules in steam is transformed as heat and may cause burns. On the other hand in case of ice, the water molecules take energy from the body and thus give a cooling effect.