"ug.L-1.h-1"^^ . "A rate of change of mass of a measurand equivalent to 10^-9 kilogram (the SI unit of mass) per litre volume of matrix over a period of 1 hour."@en . "\u00B5g/(L\u22C5hr)" . . . . "Micrograms per litre per hour"@en . . . . "2.77778e-10"^^ . . .