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    quantitykind:MacroscopicCrossSection
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    http://qudt.org/vocab/quantitykind/MacroscopicCrossSection

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    Macroscopic Cross-section
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    http://en.wikipedia.org/wiki/Cross_section_(physics)
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    http://www.iso.org/iso/catalogue_detail?csnumber=31895
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    \(\sum = n_1\sigma_1 + \cdots + n_j\sigma_j +\), where \(n_j\) is the number density and \(\sigma_j\) the cross-section for entities of type \(j\).
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    \(\sum\)
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    "Macroscopic Cross-section" is the sum of the cross-sections for a reaction or process of a specified type over all atoms or other entities in a given 3D domain, divided by the volume of that domain.