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Homework Help: Thermodynamics question (ideal gas temperatures)

  1. Apr 27, 2009 #1
    1. The problem statement, all variables and given/known data
    The temperature of an ideal gas is doubled while the volume is kept constant...

    Does the absolute pressure of the gas double when the temperature that doubles is A) the Kelvin temperature and B) the Celsius temperature. Explain?

    3. The attempt at a solution

    I can't put the solution to this in words, but I think I might have the right idea... not sure.

    1 degree celsius = 274 Kelvin, and if we were to double the celsius temperature we'd have the following:

    2 degrees celsius = 275 Kelvin.

    So while the celsius temperature doubles the absolute pressure of the gas doubles as well, but if Kelvin were to double then the absolute pressure of the gas wouldn't double but increase exponentially...?
  2. jcsd
  3. Apr 27, 2009 #2
    Can anyone throw me a bone here?
  4. Apr 27, 2009 #3
    Difficult not to give the game away here really.
    Look at the ideal gas law on wiki, look at the units of what is used.
    This shows the temperature scale you should be using.

    However: Try to put some numbers into the formula of an isochoric process using both c and K.

    Hmm acutually this question is confusing me acutally. I don't quite see the point in it as there is really only 1 scale you should be using when dealing with this sort of thing. Someones is going to have to jump in and save my *** now :(
    Last edited: Apr 27, 2009
  5. Apr 27, 2009 #4
    I think you'll get it better if you look at the equations which convert Celsius to kelvin...

    It is in fact hard to give you a hint here without giving the whole thing away... but look how the 2 are related... for instance, if you raise 1 degree Fahrenheit thats not equivalent to 1 degree celsius... if you raise 1 degree celsius, how is that related to raising by 1 kelvin?
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