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!

Homework Help: Low temp physics

  1. Feb 24, 2013 #1
    1. The problem statement, all variables and given/known data
    Why at absolute zero does He (three) have a larger molar volume and require a higher pressure to solidify than He(four)?

    3. The attempt at a solution

    I feel the answer lies in the Pauli exclusion principle, at low temps the ferions are nopt as easily confined as the bosons so they will have a larger molar volume, but i can't explain why this would then require a higher pressure to solidify:

    Pv = nRT

    where if v is increased surely P must decrease?
  2. jcsd
  3. Feb 24, 2013 #2


    User Avatar
    2017 Award

    Staff: Mentor

    I think I saw some pairing process for He3 - so you have to consider "molecules" (those are bosons again) instead of atoms.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted