"2009-07-06 15:41:29.0" . . "SDN:P07::CF12N270" . "SDN:P07::CF12N270" . . "1" . . "2009-07-06 15:41:29.0" . "1" . "mass_concentration_of_hox_expressed_as_hydrogen_in_air"@en . "SDN:P07::CF12N270" . "" . . . . "false" . . "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'. \"HOx\" means a combination of two radical species containing hydrogen and oxygen: OH and HO2. The phrase 'expressed_as' is used in the construction A_expressed_as_B, where B is a chemical constituent of A. It means that the quantity indicated by the standard name is calculated solely with respect to the B contained in A, neglecting all other chemical constituents of A."@en . "accepted"@en .