21. These different definitions of the molecular diameter can lead to slightly different values of the mean free path . 22. Is there an estimate available what the mean free path is for a neutrino inside a neutron star? 23. The phonon mean free path has been associated directly with the effective relaxation length for processes without directional correlation. 24. The mean free path is determined by the impurities and the crystal imperfections which are temperature independent as well. 25. Sometimes one measures the thickness of a material in the " number of mean free paths ". 26. Lerner's third poetry collection, " Mean Free Path ", was published in 2010. 27. The mean free path " ? " is the average distance traveled by electrons before their collisions. 28. Thus, if the electrical conductivity is low, the mean free path of the electrons is very short. 29. Where \ lambda is the mean free path of the suspending gas and d is the diameter of the particle. 30. Mean free path is one factor that determines the temperature dependence for ? L, as stated in the following equation
