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places that have recorded both -40C and +40C (lemmy.world)
submitted 1 month ago by to c/mildlyinteresting@lemmy.world
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[–] 21 points 1 month ago (4 children)

9/5(conversion ratio) of -40 is -72 which is 32(offset) below -40.

So... (9/5[F/C])*(-40[C])+32=-40[F] is where they meet.

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  • [–] 2 points 1 month ago (3 children)

    I prefer the converted fractions for ease. Your solution while right will confuse most Americans. (1.8x-40c)+32=-40f

    Dear fellow Americans: Fun tip, lazy (but inaccurate) math is (2x-40c)+30= -50f which when you get to normal ranges works well enough in a margin of error. Or just learn to enjoy the beautiful thing that is Celsius and stop using/converting to Fahrenheit.

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  • [–] 1 point 1 month ago

    Americans use fractions daily. The rest of the avoids them. The dimensional analysis maybe.

    I've done 9/5+32 in my head so much it's easier and faster for me. Then it's 100% accurate to boot.

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  • [–] 0 points 1 month ago (1 child)

    is -40 not a normal temperature, at least compared with +30c?

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  • [–] 1 point 1 month ago

    Normal should be subjective normal, -40 is an extreme temp and over 40c is also extreme. I’m talking 5-25c where the lazy math works well enough.

    So 20c is 68f proper conversion or 70f with lazy. 30, is 86f proper and 90f lazy. Basically for a normal day the temp is close enough that no one would notice.

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