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F is easy.. 0 is cold. 100 is HOT..
As an American this is how I interpret Celsius
30 is hot.
20 is nice.
10 is cool.
0 is ice.
40 and 50 can just not, please.
Yeah I'm down by 30° latitude. I'd be inclined to agree with you back when I lived north of 40°
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.
This is actually great, I've never found a good way to remember Celsius temperatures. I might go closer to Terrasque's scale though, 30 is definitely hot where I am.
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?
60 miles = 318 Kilofeet
That's exactly how I've memorised imperial as well. We must have used the same manual.
Yes, you could say Imperial is easier, because you'd never calculate anything in your head, you ask Google.
But how did that even work before we had Internet?
I suppose they had little booklets. A bit like the logarithmic tables that people kept for complicated calculations. Maybe they were issued on the first day of school or something. People would keep them all their life and look at them surreptitiously whenever they had to convert units.
1 barrel is 734 ounces. Whoo what a handy table. LOL ;)
I lived someplace with an old sticker inside a cabinet door with a bunch of basic, useful conversions. It was neat.
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?
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?
So I was a little off on the temperature chosen for the body, but the Wikipedia page has some good details: https://en.m.wikipedia.org/wiki/Fahrenheit
Re: freezing temperature of brine and pressure sensitivity, of course it is sensitive but we are talking about MPa-GPa of pressure, way beyond small pressure changes due to changes in altitude. You can get started by looking at physical chemistry of solutions if you are interested! A good place to start is "freezing point depression" and "boiling point elevation" of solutions. Also, single component phase diagrams: here it is for water.
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.