"zero air" meaning in All languages combined

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      "expansion": "zero air",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        {
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          "name": "English entries with incorrect language header",
          "parents": [
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Analytical chemistry",
          "orig": "en:Analytical chemistry",
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        {
          "kind": "topical",
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          "name": "Zero",
          "orig": "en:Zero",
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      ],
      "examples": [
        {
          "text": "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.",
          "type": "example"
        }
      ],
      "glosses": [
        "Atmospheric air specially cleaned so that it contains less than 0.1 ppm of hydrocarbon impurities."
      ],
      "id": "en-zero_air-en-noun-XBLZGs1d",
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          "analytical",
          "analytical"
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          "chemistry",
          "chemistry"
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        [
          "chromatography",
          "chromatography"
        ],
        [
          "Atmospheric",
          "atmospheric"
        ],
        [
          "air",
          "air"
        ],
        [
          "contain",
          "contain"
        ],
        [
          "ppm",
          "ppm"
        ],
        [
          "hydrocarbon",
          "hydrocarbon"
        ],
        [
          "impurities",
          "impurity"
        ]
      ],
      "qualifier": "analytical chemistry",
      "raw_glosses": [
        "(analytical chemistry, chromatography) Atmospheric air specially cleaned so that it contains less than 0.1 ppm of hydrocarbon impurities."
      ],
      "topics": [
        "chemistry",
        "chromatography",
        "natural-sciences",
        "physical-sciences"
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      ]
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  "sounds": [
    {
      "rhymes": "-ɛə(ɹ)"
    }
  ],
  "word": "zero air"
}

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      "expansion": "zero air",
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  "lang_code": "en",
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      "examples": [
        {
          "text": "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.",
          "type": "example"
        }
      ],
      "glosses": [
        "Atmospheric air specially cleaned so that it contains less than 0.1 ppm of hydrocarbon impurities."
      ],
      "links": [
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          "analytical",
          "analytical"
        ],
        [
          "chemistry",
          "chemistry"
        ],
        [
          "chromatography",
          "chromatography"
        ],
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          "Atmospheric",
          "atmospheric"
        ],
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          "air",
          "air"
        ],
        [
          "contain",
          "contain"
        ],
        [
          "ppm",
          "ppm"
        ],
        [
          "hydrocarbon",
          "hydrocarbon"
        ],
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          "impurities",
          "impurity"
        ]
      ],
      "qualifier": "analytical chemistry",
      "raw_glosses": [
        "(analytical chemistry, chromatography) Atmospheric air specially cleaned so that it contains less than 0.1 ppm of hydrocarbon impurities."
      ],
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        "chemistry",
        "chromatography",
        "natural-sciences",
        "physical-sciences"
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  "sounds": [
    {
      "rhymes": "-ɛə(ɹ)"
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  ],
  "word": "zero air"
}