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Pressure temp relationaship

  1. Jul 30, 2010 #1
    My lecturer writes the following in his lecture notes:

    " P [tex]\propto[/tex] t for a fixed volume of gas,
    P = P0(1+[tex]\alpha[/tex]t)

    Using the Celcius scale of temperature, we find [tex]\alpha \cong[/tex] 1/273."

    Is P really proportional to t?

    How do we find [tex]\alpha \cong[/tex] 1/273 using the Celcius temp scale?
  2. jcsd
  3. Jul 30, 2010 #2


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    Just another way of writing the above,

    Yes - for an ideal gas or at low pressure and reasonable temperatures.

    Experimentally - it's the definition of absolute zero
  4. Jul 30, 2010 #3
    If P [tex]\alpha[/tex] t for a fixed volume of gas, then should P not equal [tex]\alpha[/tex] t, instead of being equal to a constant P-nought times the sum of 1 and [tex]\alpha[/tex] t?
  5. Jul 30, 2010 #4
    How can it be the definition of absolute zero?
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