"accepted"@en . "SDN:P07::CF12N416" . . . . . "mass_fraction_of_terpenes_in_air"@en . "2019-03-04 17:29:46.0" . "SDN:P07::CF12N416" . "\"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\". Terpenes are hydrocarbons, that is,they contain only hydrogen and carbon combined in the general proportions (C5H8)n where n is an integer greater than or equal to one. The term \"terpenes\" is used in standard names to describe the group of chemical species having this common structure that are represented within a given model. The list of individual species that are included in a quantity having a group chemical standard name can vary between models. Where possible, the data variable should be accompanied by a complete description of the species represented, for example, by using a comment attribute. Standard names exist for some individual terpene species, e.g., isoprene and limonene."@en . . "SDN:P07::CF12N416" . . . "2" . "2019-03-04 17:29:46.0" . "" . "false" . . . "2" .