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Homework Help: Celsius to kelvin

  1. Apr 3, 2015 #1
    1. The problem statement, all variables and given/known data
    At constant volume and number of moles T1/T2=P1/P2
    As per ideal gas equation
    So given data is T1=27 degree celcius
    P1=80 Cm ,P2=120 Cm T2=?

    2. Relevant equations
    T2=P2/P1 multiplied T1

    3. The attempt at a solution:120 cm/80cm multiplied by 27 degree celcius
    =40.5 degree celcius
    It is wrong because if it is done for klelvin

    120 cm/80cm multiplied by (27+273.15)

    T2=450.225 K
    This 450.225 K is when converted into celcius it gives 177.075 degree celcius
    Thus T2=450.225 K=177.075 degree celcius "≠"40.5 degree celcius
    where I am wrong?
  2. jcsd
  3. Apr 3, 2015 #2
    The 177C is correct and the 40.5C is wrong. The ideal gas law only works with Kelvin temperature and is not supposed to work with Celsius temperature.

  4. Apr 3, 2015 #3


    User Avatar

    Staff: Mentor

    It seems that the expected answer was determined as though the data was already in Kelvin. Is there a possibility that you mistook it for Celcius?

    If not mistaken, then your answer appears correct.
  5. Apr 3, 2015 #4
    I did not understand.
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