ppm
Millionth ratio unit
Ppm stands for parts per million, a unit expressing tiny concentrations or proportions.
One ppm equals one unit of something per million units of the whole—like one drop in a large bathtub.
The measure appears in environmental science carbon dioxide levels of 420 ppm, water quality testing, and manufacturing tolerances.
Ppb (parts per billion) measures even smaller quantities.
Reduction in concentration
- ratioComparative numerical relation
- proportionComparative relation of parts
- traceMinute remnant or pursue
- levelHorizontal or uniform position
amount · threshold · content · density · abundance · saturation · percentage · quantity
Substances released into air
- contaminantsUnwelcome substances in something pure
- particulatesMinute airborne solids or droplets
- ozoneTriatomic oxygen allotrope
- exhaustUse up entirely
toxins · smog · benzene · formaldehyde · mercury · arsenic · radon
Expressing something numerically
- calibrationAdjusting for measurement accuracy
- spectrometryMeasuring radiation to identify substances
- chromatographyTechnique separating mixtures by differential migration
- instrumentationDesign of measuring devices
sensitivity · accuracy · titration · assay · sampling · standardization · metrology · resolution
dilution
Reduction in concentration
- ratioComparative numerical relation
- proportionComparative relation of parts
- traceMinute remnant or pursue
level · amount · threshold · content · density · abundance · saturation · percentage · quantity · volume
emissions
Substances released into air
- contaminantsUnwelcome substances in something pure
- particulatesMinute airborne solids or droplets
- ozoneTriatomic oxygen allotrope
exhaust · toxins · smog · benzene · formaldehyde · mercury · arsenic · radon
quantification
Expressing something numerically
- calibrationAdjusting for measurement accuracy
- spectrometryMeasuring radiation to identify substances
- chromatographyTechnique separating mixtures by differential migration
instrumentation · sensitivity · accuracy · titration · assay · sampling · standardization · metrology · resolution · spectroscopy
fluoride
Negatively charged halogen ion
- hardnessResistance to penetration
- salinityDissolved mineral concentration
- impuritiesUnwanted substances within something
- MRI/NMRMRI scan, magnetic field, resonance, T1, spectrometer
- Mudloggingchromatograph, cuttings, lag time, chromatogram, flowline
- trace analysisppb, ppt, analyte, quantification, sensitivity
- water hardnesshard water, soft water, water hardness, calcium, magnesium
- Calibrationcalibration, recalibration, zeroing, accuracy check, color calibration
- Science AbbreviationsDNA, RNA, ATP, ADP, AMP