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Should diatomic gas be regarded as ideal gas?

  1. Dec 18, 2014 #1

    kelvin490

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    Gold Member

    We know that one model for ideal gas is monoatomic gas with no attractive force between atoms, elastic collision and some other assumptions. I would like to ask if there exist a gas behave exactly the same but the only difference is it's a diatomic gas (or more complicated structure), should it be regarded as an ideal gas? (Note that the average KE for monoatomic and diatomic gas are different)
     
  2. jcsd
  3. Dec 18, 2014 #2
    Yes. We can treat diatomic gases as ideal gases also, if the pressure is low enough. The only difference is in their heat capacity.

    Chet
     
  4. Dec 18, 2014 #3

    kelvin490

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    Thanks for the answer. For monoatomic ideal gas the cv is 3R/2 and cp is 5R/2, so γ=5/3 is for monoatomic ideal gas only?
     
  5. Dec 18, 2014 #4
    Yes.
     
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