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why2?

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Latekasheery | 21:30 Tue 25th Jan 2005 | Science
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What do adding antifreze to your car, salt on roadways and farmers applying overhead irrigation water to thier crops in the winter have in common
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Avatar Image Clanad
Protects things from freeze damage...
01:44 Wed 26th Jan 2005
Avatar Image incitatus
the first two are examples of depression of freezing point of a solution by adding a solute.  not sure how this links with farmers.
10:34 Wed 26th Jan 2005
Avatar Image newtron
Clanad is correct.This is obvious for the first two examples.  Overhead irrigation protects plants from frost damage due to the phase change from liquid to solid (freezing) being an exothermic reaction (gives off heat).  The heat lost from the plants to the atmosphere is replaced by the heat released when water changes to ice.
11:25 Wed 26th Jan 2005

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