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Name: David
Status: student
Age: 14
Location: N/A
Country: N/A
Date: Sunday, September 15, 2002


Question:
Why does salt water retain heat longer than fresh water?


Replies:
I am not sure what you mean by "retain", but on either a molar or weight basis the heat capacity of salt water and fresh water is the same. Salt water contains no more than about 30% salt. For NaCl -- i.e. salt water is still mostly water. I do not think that the thermal conductivity, the heat of vaporization and other heat transfer properties are very different. Bottom line is: Where is the data to show that salt water "retains heat" longer than fresh water.

Vince Calder



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