this post was submitted on 02 May 2024
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You never deal with 0°C/32°F or 100°C/212°F unless you're in a science lab.
They are nice numbers in celcius, but for real-world applications, it's almost meaningless.
When I boil water on the stove, I don't check if it hits 100°C. When I freeze water in the freezer, I don't check if it hits 0°C.
Everyone can get by without knowing the exact degrees.
This is pure water at standard pressure. Higher or lower altitudes will change it, and if your water has minerals or impurities in it, it will also change it. It's pretty arbitrary.
Water on roads can freeze before it hits 0°C outside. It can even snow above 0°C.
Fahrenheit is a very simple scale other than those two things. <0° extremely cold, >100° extremely hot for air temperature. Freezers are 0°F and Saunas are 200°F. Hot tubs are 100°F. You bake cookies at 325° to 375°, pizza is cooked at 600° to 800°F. You'll find a lot of 25° increments in cooking.
Fahrenheit isn't really a part of the US customary units.
Knowing both Fahrenheit and Celsius, I do think Fahrenheit is simpler for real-world applications. For science they are just numbers on a scale. Converting is the only real problem.
Trying to learn Fahrenheit scale isn't that easy as an adult. I know 0 is very cold and 100 very warm. So of course it follows 50 is perfect weather. Turns out it's not.
In the end you still just have to learn by hearth that t-shirt weather starts at 70 something and that kind of stuff.
50°F is the point where you need clothes to survive. If you sat naked in a 50°F room you run the risk of your body not being able to generate enough heat and you'll slowly die.
~75°F is room temperature. It's in the middle on the warm side.
70°F is a cool room, 80°F is a warm room.
Whenever I think of Celsius I see it as 0° to 40° with 20° being room temperature. I hear 30°C and think halfway between 70 and 100 so I know it's around 85°F and I know how 85°F feels.
But like 35°C. That's 3/4 of the way from 20°C to 40°F. 100°F-70°F is 30°. 3/4 of 30 is 22.5. So 35° must be close to 70°+22.5° or ~93°F. I know how 93°F feels.
I can see how celcius is easier if you learned it as a child. 35°C would just be 35°C. But trying to quickly wrap your head around it is difficult unless you just know it. I'm sure if I said 93°F you could tell me that that is pretty hot.
75F would already be a warm room for many. 70F or 21C is usually room temperature around here. In the past this was often 65F. In more southern places 75F is middle of the night temperature and too cold.
I can see how the F scale makes some sense, but then you see some news report from Texas reaching 100F and you wonder if people can read their own temperature scale as that is clearly not fit for human habitation.
There are the "I like to keep my house at 66°F because I like to wear a hoodie or use a blanket". They are going to say that 75°F is warm or even hot for a room.
If an average person sat naked in a 75°F room they would be happy.
68°F or 20°C is cold for me. Even 70°F or 21°C. I keep my house around 72° to 74°F and bump it up or down a degree. Coming in from mowing the yard, bump it down, sitting all day watching movies, keep it the same, cold winter day, bump it up.
Older people keep their houses at 78°+
Anything above body temperature of 98.6°F (37°C) you are slowly cooking yourself. That's why 100°F is important.