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Thread: New system

  1. #1 New system 
    Forum Sophomore biohazard87's Avatar
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    Okay, so I have been playing around with the termometor in my car and I have found something very interesting in the conversion from C to F. I know that there is supposed to be a fraction to multiply by but I can nevre remeber it, and I found a system (on acciddent while listening to a canadian joke cd). And it seems that if you take the C and double it, then add 30 you get the F. like this 10CX2=20+30=50F. But I have found that this only works up to 20C and at 20C if you first subtract one then repeate the earlier steps it still works, until 25C at which point one needs to subtract 2. I haven't been able to go above 28C as it hasn't been hotter than that here yet, but I was wondering what everyone thought. This always get me with in two degrees, but usually is dead on.

    22-1=21X2=42+30=72
    25-2=23X2=46+30=76
    28-2=26X2=52+30=82


    Noodles happen when you kiss a stranger in the alps.

    Mi padre tiene un impala.
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  3. #2  
    Forum Ph.D.
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    8) just ditch F for degrees C!

    its something like, F-32/9 times ?...?

    but like i say... i dont need it.
    god bless the metric system.

    unrelated.... today, in my chemistry exam
    i lost 15 marks
    because i thought 1g=10mg, lol so i got.. 6.2ppm instead of 620ppm.
    it makes more sense.... when i think bout it now. but i hoping the examiner will see it was a bonus question (my 9th out of 8) and realise if i didnt rush i would of had a clearer head! :P i rambled.
    *stupid damiens*

    hey dude, if it works every time, use it.


    Stumble on through life.
    Feel free to correct any false information, which unknown to me, may be included in my posts. (also - let this be a disclaimer)
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  4. #3  
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    C to F is...

    multiply by 2
    subtract 1/10 of the doubled number from the doubled number
    add 32

    ...usually I can do it in my head in a few seconds...

    28 X 2 = 56
    56-5.6 = 50.4
    50.4+32 = 82.4

    Thats the exact way broken down into steps (its the same as the formula)...

    by the way, -40C is -40F...interesting fact...

    -Ajain
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  5. #4  
    Forum Sophomore CaveatLector's Avatar
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    Ummm.....

    The traditional formula, as I learned it is:

    C = 5/9(F) - 32

    F = 9/5(C) + 32
    .
    .
    .
    Cogito, ergo doleo.

    There's a fine line between genius and insanity. I have erased this line.
    Oscar Levant
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  6. #5  
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    The formulas are:

    C = 5/9 (F-32)
    F = 9/5 (C+32)

    all I know is that my way works...

    According to this converter:
    http://www.wbuf.noaa.gov/tempfc.htm
    (which I assume uses the formula based on the ungodly long decimals when converting from Fahrenheit to Celsius)...30C is 86F.

    30 * 2 = 60
    60 - 6 = 54
    54 + 32 = 86

    ...now lets plug in 28 like from my first post...converter says 82.4...

    28 * 2 = 56
    56 - 5.6 = 50.4
    50.4 + 32 = 82.4

    I forgot the proof, but the way I described is the formula, just split into mental-math steps (or at least mental math for those of us who aren't mental calculators).

    -Ajain
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  7. #6  
    Forum Sophomore CaveatLector's Avatar
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    Very Interesting......
    .
    .
    .
    Cogito, ergo doleo.

    There's a fine line between genius and insanity. I have erased this line.
    Oscar Levant
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  8. #7  
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    Which other countries besides the US and Canada still use Fahrenheit? Seems like the US is too used to it to change, but it's such a shame.
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  9. #8  
    Forum Sophomore biohazard87's Avatar
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    Actually the US created a special government board that was supposed to slowly transform the US to metric. Then they realized that it is slowly occuring even without their help, so now they are just a bunch of old guys that get paid to sit and watch the country change over to metric.
    Noodles happen when you kiss a stranger in the alps.

    Mi padre tiene un impala.
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  10. #9  
    Forum Isotope (In)Sanity's Avatar
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    Multiply C by 1.8 and add 32 to get F
    subtract 32 from F and divide by 1.8 to get C

    Also not a new idea you had,

    http://www.bbc.co.uk/weather/weather...covering.shtml
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