. "SDN:P07::CF12N393" . "mass_fraction_of_methyl_bromide_in_air"@en . . "2019-03-04 17:29:46.0" . . . "2" . . "\"Mass fraction\" is used in the construction \"mass_fraction_of_X_in_Y\", where X is a material constituent of Y. It means the ratio of the mass of X to the mass of Y (including X). 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 methyl bromide is CH3Br. The IUPAC name for methyl bromide is bromomethane."@en . . "SDN:P07::CF12N393" . "" . . "SDN:P07::CF12N393" . . "false" . "2019-03-04 17:29:46.0" . "accepted"@en . . "2" .