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Fahrenheit vs. Celsius vs. Kelvin
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this post was submitted on 07 Oct 2023
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Zero Fahrenheit is the freezing point of brine (of a certain concentration). That's water chemistry.
Originally, 90F was based on the average human body temperature, but that later changed to 96F, which just goes to show how arbitrary that scale is.
It's all arbitrary. Someone just decided to base a scale off of something and that something isn't fixed from the start. The meter used to be based off the measurement of the earth, but now it's based off of light.
It's just some random semi-useful starting point that we all agree on so we're using the same language.
The meter did not change, science has merely defined it more precisely and reliably over time. It is a measure of length, still one 40 millionth of the circumference of the earth through the poles. Other definitions like the speed of light definition will give you the same result. These newer definitions have reduced uncertainty and added ways to reproduce its length by natural means. But it's not like the 'original' meter was shorter or longer than today's meter, at least not by any noticeable margin.
Shifting the top end of a temperature scale by over five percent of the scale is a bit more arbitrary than that.