1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    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!

Two monatomic ideal gases are in thermal equilibrium with ea

  1. Nov 4, 2016 #1
    1. The problem statement, all variables and given/known data
    Two monatomic ideal gases are in thermal equilibrium with each other. Gas A is composed of molecules with mass m while gas B is composed of molecules with mass 4m. The ratio of the average translational kinetic energies KA/KB is:

    2. Relevant equations
    KE=0.5xmxVavarage^2
    ATTEMPTS:]
    KE!/KE2 all are constants except m then it will be 1/4
    but the correct answer is one why?
     
  2. jcsd
  3. Nov 4, 2016 #2

    phyzguy

    User Avatar
    Science Advisor

    What is temperature? What does it mean to be in thermal equilibrium?
     
  4. Nov 4, 2016 #3
    it means delta T=0 then delta Einternal=0
     
  5. Nov 4, 2016 #4

    phyzguy

    User Avatar
    Science Advisor

    You didn't answer my question about what is temperature.
     
  6. Nov 4, 2016 #5
    Temperature is a measurement of how heat or cold an object is. It reflects the delta internal energy where the change in temprature will cause a change in internal energy.
    Is that what you mean?
     
  7. Nov 4, 2016 #6

    phyzguy

    User Avatar
    Science Advisor

    From the Wikipedia article on temperature:

    "The kinetic theory offers a valuable but limited account of the behavior of the materials of macroscopic bodies, especially of fluids. It indicates the absolute temperature as proportional to the average kinetic energy of the random microscopic motions of those of their constituent microscopic particles, such as electrons, atoms, and molecules, that move freely within the material."
     
  8. Nov 4, 2016 #7
    okay, but also its proportional to mass
     
  9. Nov 4, 2016 #8

    phyzguy

    User Avatar
    Science Advisor

    No! It's not! Temperature is proportional to the average kinetic energy of the constituent particles. So if two gases have equal temperatures, they have equal average kinetic energies. So the heavier particles are moving slower.
     
  10. Nov 4, 2016 #9
    ah okay I got your point thanks
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Two monatomic ideal gases are in thermal equilibrium with ea
Loading...