Salt and Fresh Water Specific Heat
Date: Sunday, September 15, 2002
Why does salt water retain heat longer than fresh water?
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.
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