1. Not finding help here? Sign up for a free 30min 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!

Stat Mech Question

  1. Mar 26, 2009 #1
    An ideal gas of N molecules in a volume V. Write down the mean and standard deviation of the number of molecules n to appear in a volume V/3. Sketch the probability distribution of n and of n/N. Indicate how the curves change as N increases.

    ok. [itex]\bar{n}=\sum_i n_i P_i[/itex]

    do i use [itex]P_i[/itex] form the grand canonical distribution or from teh canonical distribution here? i was going to go with the former as the subsystem of volume V/3 is an open system i.e. it can exchange energy AND particles with the rest of the system - but i wanted to check??

    for the variance, do i just use

    [itex]\bar{\Delta n^2}= \bar{n^2} - \bar{n}^2[/itex]???

    what would the graphs look like?

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

Can you offer guidance or do you also need help?



Similar Discussions: Stat Mech Question
  1. Stat phys problem (Replies: 0)

  2. Redshift question (Replies: 0)

Loading...