"SDN:P07::CF12N325" . "1" . . . "false" . "SDN:P07::CF12N325" . . . . . "1" . "accepted"@en . "SDN:P07::CF12N325" . "" . "2009-07-06 15:41:29.0" . "mass_concentration_of_xylene_in_air"@en . "2009-07-06 15:41:29.0" . . . "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 xylene is C6H4C2H6. In chemistry, xylene is a generic term for a group of three isomers of dimethylbenzene. The IUPAC names for the isomers are 1,2-dimethylbenzene, 1,3-dimethylbenzene and 1,4-dimethylbenzene. Xylene is an aromatic hydrocarbon. There are standard names that refer to aromatic_compounds as a group, as well as those for individual species."@en .