this post was submitted on 09 Dec 2024
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It’s always worth bringing this out again at times like these, while the US trots out the same old excuses for their lack of progress that every other country that used to have old measurements has made.
“It’s fine”.
I'm in agreement with everything except temperature. I'm not saying that Celsius is bad, but I do think that using the phase changes of water as the sole point of comparison is a bad argument.
For most people, the interaction with temperature is through the weather, and I don't think Celsius is inherently better for that. I like that in Fahrenheit 0 is a cold winter's day, and 100 is a hot summer's day. I find that more relevant in day-to-day life than the phase changes of water. The big argument I see for preferring Celsius is that everybody else is doing it, so we may as well jump in.
However, in regards to the other systems of measurement, metric is best. The imperial system was nice when manufacturing measuring tools was difficult, so using easily divisible numbers allowed for easier creation of accurate measuring devices. But it has been quite some time since that was a reasonable argument (and that's only really relevant for some of the units anyway).
Why? Water is extremely important to life and very abundant. The phases changes of water are something that you are confronted with in every day life, all the time.
I do, because the temperature being above or below freezing is a very important boundary. Freezing temperatures means slippery roads, frost on windows, car locks freezing shut, etc. A lot of our interaction with the world outside is affected by the temperature being below or above 0ºC. By comparison, 0ºF is completely arbitrary, nothing changes when you cross that boundary.
10ºF is also a cold day, so is 20ºF and 30ºF. Just like 90ºF is also a hot summers day.
None of those seem relevant to me. I don’t need a round number to know that 37ºC is a hot day. There is no significance to 100ºF. 99ºF is also a hot day and so is 101ºF. Nothing interesting happens when you cross the 100ºF threshold.
When you cross the 0ºC or 100ºC, potentially dangerous things start to happen of which you need to be aware.
Right. You learn two numbers for the phase changes of water, and we do as well. It's easy to remember two numbers and understand when you've crossed a boundary. Sure, learning 0 and 100 might be easier than 32 and 212, but I don't think that understanding whether a number is smaller or larger than 32 is really harder than understanding if it's smaller or larger than 0. Both are pretty much instantaneous recognitions for a numerically literate person.
My point was merely that the Fahrenheit defines these two points in such a way that the ambient temperatures that we experience generally fall nicely within the range of 0 to 100, and I don't think that this fact is any less compelling an argument than having nicer numbers for the boundaries of liquid water. I'm not saying that Celsius is bad. I'm just saying that the range of liquid water is not a convincing enough argument for me.
For other units of measures, the ease of converting units in metric is a clear win over imperial (or US customary). For temperature, there are benefits to both scales, and neither has as compelling an argument as we see in the meter vs the yard or the kilogram vs the pound. The only really convincing argument for me is that the rest of the world uses Celsius, and I think that is a good enough argument.