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The_Doc_Man
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Re: NASA Study Indicates Antarctica is Gaining More Ice Than It's Losing -

As I understand it, ANY slow crystallization will have that "purification" effect. It is how we make "pure cane sugar" in the deep South. Crush the sap out of sugar cane, heat it to a boil, and then reduce the heat slightly. Eventually you get crystal formation by, essentially, a differential distillation and condensation and eventual solidification.

If you've never been around the process, it actually stinks because that "differential" method leaves behind some pretty smelly dregs. But then, a related process occurs in crude oil distillation into various "fractions" in a fractionating tower. Again, balancing entropy against enthalpy (a specific way of measuring chemical energy) allows for separation of mixed components.


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