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If you keep ice at 0 Co and water at 0 Co in either of your hands, in which hand you will feel more chillness? Why?
 
The hand having  at 0 Co will feel more chillness than of 0 Co.
  
 is energy absorbed or released by a substance during a change in its physical state (phase) that occurs .
  
Ice needs  to convert itself to water at zero degree Celsius. Thus, it absorbs more heat from the liquid system making the liquid system . So, ice at 0 Co is  than water at 0 Co.