Parts per Billion
Parts per billion
A means of expressing minute concentrations, often of an element, compound, or particle that contaminates soil , water, air, or blood. The expression may be on either a mass or a volume basis, or a combination of the two, such as micrograms of a chemical per kilogram of soil, or micrograms of chemical per liter of water. In the United States, one billion equals 1x109. Dioxin , a contaminant associated with the herbicide 2,4,5-T and implicated in the formation of birth defects , can cause concern at concentrations measured in ppb.
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Angstrom , angstrom
angstrom •minimum • maximum • optimum •chrysanthemum, helianthemum •cardamom • Pergamum • sesamum •per annum • magnum • damnum •Arnhem, Barn… Density , density •banditti, bitty, chitty, city, committee, ditty, gritty, intercity, kitty, nitty-gritty, Pitti, pity, pretty, shitty, slitty, smriti, spitty… PER CAPITA , per capita •bitter, committer, critter, embitter, emitter, fitter, flitter, fritter, glitter, gritter, hitter, jitter, knitter, litter, permitter, pi… Concentration , Concentration is the degree to which one substance is present in a mixture. The concentration of each substance in a mixture can be expressed in mass… Dr. Dre , dpi Abbrev. for dots per inch.
dpi Computing dots per inch Water chemistry , Aquatic chemistry
Water can exist in various forms within the environment , including: (1) liquid water of oceans, lakes and ponds, rivers and stream…
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Parts per Billion