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Temperature scale: When will Celsius and Faranheit scales agree with each other?

  1. Feb 5, 2009 #1
    1. The problem statement, all variables and given/known data
    Calculate the one temperature at which Fahrenheit and Celsius thermometers agree with each other.

    2. Relevant equations
    TF = TC * (9/5) + 32°C
    TC = ( TF + 32 ) * (5/9)
    TK = TC + 273.15

    3. The attempt at a solution
    *Shrug* I can't even understand how to set it up...

    4. The answer
    -40°C
     
  2. jcsd
  3. Feb 5, 2009 #2

    LowlyPion

    User Avatar
    Homework Helper

    Forget Kelvin

    If

    TC = ( TF - 32 ) * (5/9)

    Simply set TF to TC

    TC = ( TC - 32 ) * (5/9)

    and solve.

    Note your second equation is in error.
     
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