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A good metric I once heard was:

Fahrenheit is what humans feel

Celsius is what water feels

Kelvin is what atoms feel

Also, for converting between km and miles, using the Fibonacci sequence is a 'good enough' estimator.

5 miles is ~8 km, 21 miles is ~34 km. 13 km is ~8 miles, 55 km is ~34 miles.

Drop or add decimals to get to numbers not in the sequence. If you want to know what 6 km, use 5.5km and you see that its a bit over 3.4 miles.

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That makes no sense. Kelvin and Celsius are the same, just with a different 0.

I know exactly what a temperature of 0°C, 10°C, 20°C or 30°C will feel like, and I’m pretty sure I’m human.

I think that the idea is "what it feels like in a scale of 0 to 100".

So, in Celsius, water are "very cold" (=freezing) at 0 degrees but "very hot" (=boiling) at 100 degrees. Same with Fahrenheit: 0 is extremely cold while 100 is very hot.

I get the logic but I am too used to Celsius at this point, just like you.

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