concentration

http://en.wikipedia.org/wiki/Concentration
Table of concentration measures
Frequently used standards of concentration Measurement Notation Generic formula Typical units
atomic percentage (A) at.% %
atomic percentage (B) at.% %
Mass percentage - %
Mass-volume percentage - % though strictly %g/mL
Volume-volume percentage - %
Molarity M mol/L (or M or mol/dm3)
Molinity - mol/kg
Molality m mol/kg (or m)
Molar fraction Χ (chi) (fraction)
Formal F mol/L (or F)
Normality N N
Parts per hundred % (or pph) da.g/kg
Parts per thousand ‰ (or ppt*) g/kg
Parts per million ppm mg/kg
Parts per billion ppb µg/kg
Parts per trillion ppt* ng/kg
Parts per quadrillion ppq pg/kg

* Although 'ppt' is usually used to denote 'parts per trillion', it is on occasion used for 'parts per thousand'. Sometimes 'ppt' is also used as an abbreviation for precipitate.

Note (1) : The table above is described in terms of solvents and solutes; however the units given often also apply to other types of mixture.

Note (2) : The use of billion, trillion, quadrillion above follows the short scale usage of these words


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