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Kelvin vs Celsius

  1. Dec 1, 2007 #1
    Why must we use absolute temperature in the ideal gas law (PV = NkT)?
    Why using the Celsius scale would give nonsensical results?

    I am not sure what is the reason, can anyone helps?
  2. jcsd
  3. Dec 1, 2007 #2
    The temperature measured in Kelvin degrees cannot ever be negative.
  4. Dec 1, 2007 #3


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    At 0C the pressure in an ideal gas is not zero. It's zero at absolute zero. Which is 0K.
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