ppm
Related Words
concentrationmeasurementratioproportionpercentagefractionpartmillionmetricunitscaledensitypurityimpuritycontaminantpollutanttraceamountquantityvolumemassweightmolaritymolalitysolutesolventsolutiondilutionchemistryphysicsbiologyecologyenvironmentpollutionemissioncarbondioxideoxygennitrogenmethaneozoneatmosphereairwaterliquidgassolidanalysisassaytitrationspectroscopychromatographysensordetectorcalibrationprecisionaccuracythresholdlimitstandardbenchmark