Parts per billion definition
Parts per billion or “ppb” means the ratio of the parts of a specified contaminant to a billion parts of air by weight (1:10-9), as measured and determined by the methods prescribed for that contaminant.
Parts per billion means the Standard unit for the concentration of a gas constituent relative to one billion parts.
Parts per billion. (ppb) means parts per billion by weight.
Examples of Parts per billion in a sentence
ATSDR Agency for Toxic Substances and Disease Registry ODH Ohio Department of Health ppb Parts per billion ND None Detected PCE Tetrachloroethene TCE Trichloroethene Source: ATSDR 2008.