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High purity refers to a low amount of impurities in the gas. Gases of higher purity are considered to be of better quality. The purity of a gas is generally expressed as a grade prefixed with the letter N giving the "number of nines" in the percentage or decimal fraction.
Some applications: Manufacturing of semiconductors, as a carrier gas in gas chromatography and mass spectrometry, lab research, weather balloons, cooling gas for fibre optics, photovoltaics (manufacture of solar panels).
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