1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Science Advisor
    Homework Helper


    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?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook