✔ 最佳答案
The specific heat capacity of a substance depends very much on the molecular structure of that substance. Ice and water are of different structures. Because of this reason, the change of potential energy of an ice molecule is different from that of a water molecule for a degree change of temperature. This differences in change of potential energy are thus reflected on their respective specific heat capacities.
It is not difficult to find from the web that ice at zero degree Celsius has a specific heat capacity of 2050 J/kg-K (as compared with about 4210 J/kg-K for water) and its specific heat capacity decreases with the lowering of temperature.
You may refer to the table in the following web-page:
http://www.engineeringtoolbox.com/ice-thermal-properties-d_576.html
Also, the following answer may be taken as another reference.
http://wiki.answers.com/Q/Why_is_the_specific_heat_capacity_of_ice_different_from_that_of_water_even_though_they_are_made_of_the_same_material