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Related Concept Videos

Mean free path and Mean free time01:22

Mean free path and Mean free time

Consider the gas molecules in a cylinder. They move in a random motion as they collide with each other and change speed and direction. The average of all the path lengths between collisions is known as the "mean free path."
Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
Transport Number01:31

Transport Number

The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...

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Related Experiment Video

Updated: Jun 19, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow
08:01

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Published on: May 1, 2018

Measuring the transport mean free path using a reference random medium.

A A Lisyansky, J H Li, A Z Genack

    Optics Letters
    |October 27, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study determines the transport mean free path of microwave radiation using a novel transmission measurement technique. The method involves a composite sample and can be adapted for optical frequencies.

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    Area of Science:

    • Physics
    • Optics
    • Materials Science

    Background:

    • Characterizing radiative transport in scattering media is crucial for understanding wave propagation.
    • Accurate determination of the transport mean free path (MFP) is essential for modeling light and microwave interactions.

    Purpose of the Study:

    • To develop and validate a method for measuring the transport mean free path of microwave radiation.
    • To demonstrate the applicability of this method at optical frequencies.

    Main Methods:

    • Transmission measurements were performed on a composite sample.
    • The composite sample consisted of a medium with unknown scattering properties and a random medium with known parameters and variable thickness.
    • A ceramic wedge was used as the variable thickness medium for optical frequency adaptation.

    Main Results:

    • The transport mean free path of microwave radiation was successfully determined.
    • The proposed method provides a reliable way to characterize scattering media.

    Conclusions:

    • The developed transmission measurement technique is effective for determining the transport mean free path.
    • The method's adaptability to optical frequencies broadens its potential applications in diverse scientific fields.