"SDN:P07::CF12N332" . "2009-07-06 15:41:29.0" . "" . "SDN:P07::CF12N332" . . . . . . "1" . . . "mass_fraction_of_ammonia_in_air"@en . "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 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 ammonia is NH3."@en . "SDN:P07::CF12N332" . . "accepted"@en . . "1" . "false" . "2009-07-06 15:41:29.0" .