Anti freeze is not only to prevent freezing. Any material disolved in water
changes both the freezing and the boiling points. (Lowers the freezing and
raises the boiling) The result is that not only do you protect from freezing
you also help prevent boil over. Since our cars run hot that's a good idea.
By the way raising the pressure also raises the boiling point. Hence most cars
now have significantly higher relief valves (radiator caps) then they used to.
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