 FACTOID # 21: 15% of Army recruits from South Dakota are Native American, which is roughly the same percentage for female Army recruits in the state.

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Encyclopedia > Mean free path

For sound waves in an enclosure, the mean free path is the average distance the wave travels between reflections off of the enclosure's walls. For a particle, such as a molecule, the mean free path is the average distance the particle travels between collisions with other particles in its ensemble. A schematic representation of hearing. ... Jump to: navigation, search A wave is a disturbance that propagates in a periodically repeating fashion, often transfering energy. ... The reflection of sunlight on water Reflection is the abrupt change in direction of a wave front at an interface between two dissimilar media so that the wave front returns into the medium from which it originated. ... Jump to: navigation, search A molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties. ...

The formula for calculating the magnitude of the mean free path depends on the characteristics of the system the particle is in. For particles with a high velocity relative to the velocities of an ensemble of identical particles with random locations, the following relationship applies:

Where is the mean free path, n is the number of particles per unit volume, and σ is the effective cross-sectional area for collision. If, on the other hand, the velocities of the identical particles have a Maxwell distribution of velocities, the following relationship applies: Cross section may refer to the following In geometry, Cross section is the intersection of a 3-dimensional body with a plane. ... The Maxwell-Boltzmann distribution is a probability distribution with applications in physics and chemistry. ... Results from FactBites:

 Mean free path - Wikipedia, the free encyclopedia (187 words) For sound waves in an enclosure, the mean free path is the average distance the wave travels between reflections off of the enclosure's walls. For a particle, such as a molecule, the mean free path is the average distance the particle travels between collisions with other particles in its ensemble. is the mean free path, n is the number of particles per unit volume, and σ is the effective cross-sectional area for collision.
 Mean Free Path, Molecular Collisions (473 words) The mean free path or average distance between collisions for a gas molecule may be estimated from kinetic theory. The mean free path equation depends upon the temperature and pressure as well as the molecular diameter. You may be surprised by the length of the mean free path compared to the average molecular separation in an ideal gas.
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