. "2006-09-26 18:12:43.0" . "" . "deprecated"@en . "SDN:P07::CFSNA022" . "true" . . . . "2006-09-26 18:12:43.0" . . "SDN:P07::CFSNA022" . "1" . . "mass_fraction_of_o3_in_air"@en . . "1" . "SDN:P07::CFSNA022" . . . "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 Y to the mass of X (including Y)."@en .