K = 273 + 5(F - 32)/9 is even worse
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Why use kelvin when R = F - 459.67
Sure, if one would use Fahrenheit as go to unit..
I'm from the UK and part of the forgotten generation, so I was pretty much brought up on both systems. The "cheaper" way to do F from C is double it and add thirty. It works reasonable enough. Of course the reverse is minus thirty then half.
I'm definitely more native in deg C, but am fine with deg F too. Yes, I added deg to stop the coding jokes.
Yeah, SCIENCE, bitch!
F = C + 32 + 'ish'.
That's not right, it should be F = 2C + 32 + 'ish'
For easier mental C -> F conversion, take (2C)-(2C/10)+32 where C = temp in c.
16c × 2 = 32
32/10 = 3.2
32 - 3.2 = 28.8
28.8+32 = 60.8, which is exactly correct.
Or if you just want a rough estimate for weather, 2C+(22 to 32) gets you close enough with easier mental math
16x2+30 = 62, just 1 degree off.
37x2+30 = 104 is like 6 degrees off, though. The further from zero you are, the smaller the number you should add.
Rankine gang rise up