I'm not convinced that warm water freezes faster than cold water. When a tray of warm water and 'cold' water are placed in the freezer the warm water tray can freeze faster, but this is due to the warmer water caused melting below it and tray makes better contact the freezer than the cold water tray.

Heat in water can be measured in calories. Heat calories have to be lost or removed for water to freeze. Warm water has more heat calories than colder water. Those heat calories have to be removed to the point the water freezes. The more heat calories there are the longer it takes to remove those calorie units and freezing occurs. The same principle should apply to water evaporation. See into in this link.
http://www.physlink.com/Education/AskExperts/ae7.cfm

Here is an interesting discussion on water evaporation:
https://van.physics.illinois.edu/qa/listing.php?id=1474
Cold water vs warm water evaporation
https://van.physics.illinois.edu/qa/listing.php?id=16382


Last edited by Bill Cody; 09/28/15 01:43 PM.

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