November 16th, 2017, 02:52 AM  #1 
Senior Member Joined: Feb 2016 From: Australia Posts: 1,453 Thanks: 489 Math Focus: Yet to find out.  Mean free path
I was reading this wiki article, https://en.wikipedia.org/wiki/Mean_free_path. I don't understand how we can define the mean free path without defining how the particle(s) are confined. Are they in a box? A tube? Are there boundaries? 
November 16th, 2017, 03:40 AM  #2 
Senior Member Joined: Jun 2015 From: England Posts: 704 Thanks: 202 
Surely the mean free path is defined by the average distance the a particle travels before it bumps into another particle of the same fluid. It is assumed that the fluid is infinite in extent. Adding boundaries of any sort changes the situation, just as you observe, because the boundaries will not be moving randomly, like all the other particles. 
November 16th, 2017, 07:43 AM  #3 
Senior Member Joined: Apr 2014 From: Glasgow Posts: 2,080 Thanks: 698 Math Focus: Physics, mathematical modelling, numerical and computational solutions  
November 16th, 2017, 01:14 PM  #4 
Senior Member Joined: Feb 2016 From: Australia Posts: 1,453 Thanks: 489 Math Focus: Yet to find out. 
I see. Thanks guys.


Tags 
free, path 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Free program that calculate Math formulas for free  stringnumargs  Algebra  6  June 28th, 2015 04:29 PM 
Free Source Code for moments of path integrals of a Stochastic Process  AhsanAmin  Advanced Statistics  0  December 10th, 2014 04:43 PM 
path dependent function with a definite path  aise5668  Real Analysis  3  March 5th, 2012 07:36 PM 
A torsion free abelian group G having a free abelian subgrou  johnmath  Abstract Algebra  9  April 25th, 2011 11:58 AM 