. "mass_concentration_of_rain_in_air"@en . "SDN:P07::BBAD2111" . "2011-03-23 08:07:46.0" . . "1" . "false" . . "2011-03-23 08:07:46.0" . . "SDN:P07::BBAD2111" . "accepted"@en . "1" . "" . "SDN:P07::BBAD2111" . . "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\". \"Rain\" means drops of water falling through the atmosphere that have a diameter greater than 0.5 mm."@en . . .