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this post was submitted on 16 Jul 2023
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F is easy.. 0 is cold. 100 is HOT..
As an American this is how I interpret Celsius
As a Norwegian:
I regularly convert between the two just by remembering the conversions for 10, 20, 30, and 40. It's actually pretty easy.
If you ever forget what one of them is, then just add 18F for every 10C from the last one you remember.
As a Canadian, 50 is kill me right now cause fuck that, 40 would be constant cold showers to stay cool, 30 is uncomfortable and needs occasional cold showers, 20 is perfect summer weather, 10 is perfect spring weather and 0 is a nice winter day.
Can't stand the heat, I'll take -30C over +30C any day. Can always put on more layers if you're cold, there's only so much you can take off when you're hot though.
30 is hot.
20 is nice.
10 is cool.
0 is ice.
40 and 50 can just not, please.
Metric:
10 mm = 1cm, 100 cm = 1m, 1000 mm = 1m, 1000m = 1 km.
1 cm3 water = 1 gram
1 Watt heats 1 gram of water 1 C°
1 dm3 water = liter = 1 kg
1 m3 = 1000 kg = 1 tonne
Imperial:
1 mile = ?? yards = ?? feet = ?? inches
1 ton = ?? stone = ??punds = ?? oz = ?? grain
1 Galon = ?? pints = ?? fluid ounce
1 inch3 = ?? grain = ?? power to heat ?? fahrenheit
There is no system to any of these, they are unscientific and impractical.
How does Imperial still have any relevance as a measurement system?
Thinking about it... Isn't that exactly what the Celsius scale does just with reliable definitions about what "cold" and "HOT" mean?
Shower water with 38°C is hot, a bowl of rice at 38°C/100F is decidedly not "HOT". So the perceived convenience of the Fahrenheit scale is not applicable to everything, is it? How is it convenient then?
It is convenient because they are used to it. That is all there is to it, and peace be to that.
It only becomes silly when they begin to claim that F is better for "human temperature", because again it all comes down to what you are used to and celsius is just as convenient if you are used to that.
O F is the freezing temperature of a saturated brine solution, while 100 F was the body temperature of a human. Yes, body temperature has been revised a bit, but the two points were chosen as stable points that anyone could access that would generally be unchanged by pressure changes, etc. Human homeostasis is quite good at keeping a temperature in a narrow range. Also, boiling is massively affected by air pressure. At 5000' elevation, boiling is approximately 202 F and continues to get lower as altitude increases. Lots of people live at higher altitudes. (Hi! I am one of them !)
Edit: I was a little off on the temperature selected for body temp, but still pretty close: https://en.m.wikipedia.org/wiki/Fahrenheit
This is really interesting and I think there is a lot of support for the body temperature point. I was curious about whether the method of deriving 0F is insensitive to pressure changes and I can't find any evidence of that. But I don't know enough about chemistry or physics myself. Do you know, or have any details on where you learned this?