@prefix rdf: . @prefix owl: . @prefix xsd: . @prefix rdfs: . a ; rdfs:isDefinedBy ; rdfs:label "Femtograms per litre"@en ; "One 10**18 part of the SI standard unit of mass of the measurand per litre volume of matrix.."@en ; , , , ; 0.000000000000001 ; 1.0E-15 ; ; , ; "fg/L" ; "fg.L-1"^^ , "fg/L"^^ .