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I Free electron Pressure

  1. Aug 2, 2016 #1
    The pressure of the electrons of Copper are about 105atm. Why, then, don’t the electrons in a piece of copper simply explode out of the metal?
  2. jcsd
  3. Aug 2, 2016 #2


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    where did you read this ? it doesn't sound right
    maybe you misunderstood what was being said
  4. Aug 2, 2016 #3
    The electrons are not alone in the piece of Cooper, are they?
  5. Aug 2, 2016 #4
    (Sorry for my poor English.) I was thinking of a cooper wire under a potential difference. I forgot where I read about that pressure of free electrons.
  6. Aug 2, 2016 #5
    The pressure of the free electron gas has nothing to do with some external potential difference.
    It is related to the energy of the Fermi electron gas.
    You can read about it in solid state textbooks.

    But a copper wire contains more than just the electron gas.
  7. Aug 2, 2016 #6
    Ok, so how large is the pressure due the conduction electrons in a ordinary wire?
  8. Aug 2, 2016 #7
  9. Aug 2, 2016 #8
    then why don’t the electrons explode out of the wire?
  10. Aug 2, 2016 #9
    I asked you twice. What else is there in a piece of wire, besides the electrons?
  11. Aug 2, 2016 #10
    uuh ok, I'm sorry, you mentioned that earlier. Then would the ions create a "negative" pressure?
  12. Aug 2, 2016 #11
    The positive ions and the negative electrons create a stable system.
    This is taken into account when the electrons in the "free" electron gas are treated as particles in a box.
  13. Aug 2, 2016 #12
    Now I have understood it. Thank you !
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