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Politics : Foreign Affairs Discussion Group -- Ignore unavailable to you. Want to Upgrade?

To: Hawkmoon who wrote (15750)	1/7/2002 11:47:40 AM
From: Ish	Read Replies (1) \| Respond to of 281500

Saltwater does freeze but at a lower temperature than fresh. When it gets much below zero our township guy quits salting the roads. For saltwater that's as saturated as it can possibly get (i.e. there's no way to dissolve any more salt in it no matter how hard you tried), the freezing point is -21.1 degrees Celsius. This is when the saltwater is 23.3% salt (by weight).

To: Hawkmoon who wrote (15750)	1/7/2002 12:06:27 PM
From: FaultLine	Read Replies (1) \| Respond to of 281500

"The fresh water floating on the colder, denser salt water freezes at a higher temperature so the ice cap forms faster and lasts longer insulating the salt H2O below." This is true. Salt water doesn't freeze. This is not true. Solutes lower the freezing temperature. They do not eliminate it. That's why they throw salt on icy roads. The salt lowers the freezing point of the salty solution around the granules causing localized melting, pitting, and weakening of the ice surface. The surface will refreeze if the temperature continues to fall. Thus, fresh water would likely freeze at a lower temperature than denser salt water (as salt is pushed out by the solidifying water turning to ice). The pure fresh water will absolutely freeze at a higher temperature. And the salts are NOT pushed out by freezing. The metallic and non-metallic ions remain dispersed in the crystal that forms. --fl