zero air
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English
Pronunciation
- Rhymes: -ɛə(ɹ)
Noun
- (analytical chemistry, chromatography) Atmospheric air specially cleaned so that it contains less than 0.1 ppm of hydrocarbon impurities.
- For calibration, first pass a known range of concentrations of the gas through the gas chromatograph, for comparison with zero air that contains effectively none of the gas to be measured.