part per billion
http://purl.obolibrary.org/obo/UO_0000170
Term info
database cross reference
- NCIt:C70565
- SNOMEDCT:282106003
definition
A dimensionless concentration notation which denotes the amount of a given substance in a total amount of 1,000,000,000 regardless of the units of measure as long as they are the same or 1 part in 10^[9].
has exact synonym
ppb, 10^[-9]