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The average length that a molecule will travel in a fluid before colliding with another molecule.
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the electromagnetic shock-wave due to a charged particle traveling through a medium faster than the speed of light in that medium.
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the distance over which significant charge separation can occur in a conductive material or plasma due to a variety of effects.
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related to scattering amplitudes.
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equalities involving the mixed second partial derivatives of thermodynamic potentials.
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Small bodies made of stone and/or metal found in the Solar System.
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