Quote:
Originally Posted by Street Pharmacist
Very few I would guess if any. None that I am aware of. Virtually any pollutant in water decreases the hydrogen bonding that makes water solid. Adding virtually anything to water lists the melting temperature (ie. Salt dissolves in water and boom, it needs to be even colder to freeze it)
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That is kind of true for seawater. Pure H20 can reach -4 C before freezing because it has nothing to induce crystals. I would suspect crystal catalysts are added to freeze water at higher temps.