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Celsius is the same, except with just water and ice - you don't need to get some salt concentration right to reliably reproduce the zero, eliminating that as a variable. "Moderating itself until ice melts" is just something water does, no salt required.
Yeah, I've always wondered why they didn't want to just use a frigorific slush without salt. I'm guessing that the salt version is more robust about maintaining its temperature, or it lasts longer, or something like that.
You can't have water reliably below freezing without something like salt to keep it liquid? 0F is not serving the same purpose as 0C is. Not making an argument, just pointing out that they're specifically after a liquid mixture that is below freezing for cooling things down to below freezing in times before refrigeration.