. . . "SDN:P07::CF12N262" . "" . "mass_concentration_of_halon1211_in_air"@en . "accepted"@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 or biological 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 Halon1211 is CBrClF2. The IUPAC name for Halon1211 is bromo-chloro-difluoromethane."@en . . . . . . . . .