question_answer

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

Answer:

                  When ice melts, it absorbs the energy equal to the latent heat effusion from the surroundings therefore causes cooling effect. But steam releases the extra heat (equal to the latent heat of vaporisation) which it has absorbed when water was converted into steam. So, steam produces severe burns.   (2)