this post was submitted on 19 Jun 2023
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It... isn't. That would change wildly depending on which sea/ocean you get your saltwater from (more salt = colder freezing point).
It really is defined relative to a very specific brine mixture (in the most scientifically generous origin story - some say he literally just measured the coldest winter day he could). Well except it isn't anyway, because like all US units nowadays it's defined against metric units (namely the Kelvin, just like 0°C is actually defined to be 273.15 K).