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<?xml version="1.0" encoding="UTF-8"?>
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    <skos:definition xml:lang="en">Mass concentration means mass per unit volume and is used in the construction mass_concentration_of_X_in_Y, where X is a material constituent of Y. A chemical species denoted by X may be described by a single term such as 'nitrogen' or a phrase such as 'nox_expressed_as_nitrogen'. The chemical formula for o-xylene is C8H10. O-xylene is a member of the group of hydrocarbons known as aromatics. The IUPAC name for o-xylene is 1,2-xylene.</skos:definition>
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