. "2024-01-18 09:01:44.0" . "false" . . "SDN:P07::8RT94HBX" . . . . "1" . "" . "2024-01-18 09:01:44.0" . "\"Mole fraction\" is used in the construction \"mole_fraction_of_X_in_Y\", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as \"nitrogen\" or a phrase such as \"nox_expressed_as_nitrogen\". The phrase \"in_dry_air\" means that the quantity is calculated as the total number of particles of X divided by the number of dry air particles, i.e. the effect of water vapor is excluded. The chemical formula of carbon monoxide is CO."@en . "mole_fraction_of_carbon_monoxide_in_dry_air"@en . "1" . "SDN:P07::8RT94HBX" . . "SDN:P07::8RT94HBX" . "accepted"@en .