"alkaline air" meaning in English

{
  "head_templates": [
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      "args": {
        "1": "-"
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      "expansion": "alkaline air (uncountable)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Chemistry",
          "orig": "en:Chemistry",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
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          "source": "w"
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      "examples": [
        {
          "ref": "2004, Robert E Schofield, The Enlightened Joseph Priestley, Pennsylvania State University, published 2004, page 94",
          "text": "Private individuals in England, France, and Italy knew of Priestley's discovery before he made it public with a paper on alkaline air read to the Royal Society on 3 March 1774.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Ammonia."
      ],
      "id": "en-alkaline_air-en-noun-Nuyu5Pqk",
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "Ammonia",
          "ammonia"
        ]
      ],
      "raw_glosses": [
        "(chemistry, now historical) Ammonia."
      ],
      "tags": [
        "historical",
        "uncountable"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "alkaline air"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "alkaline air (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses",
        "English terms with quotations",
        "English uncountable nouns",
        "en:Chemistry"
      ],
      "examples": [
        {
          "ref": "2004, Robert E Schofield, The Enlightened Joseph Priestley, Pennsylvania State University, published 2004, page 94",
          "text": "Private individuals in England, France, and Italy knew of Priestley's discovery before he made it public with a paper on alkaline air read to the Royal Society on 3 March 1774.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Ammonia."
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "Ammonia",
          "ammonia"
        ]
      ],
      "raw_glosses": [
        "(chemistry, now historical) Ammonia."
      ],
      "tags": [
        "historical",
        "uncountable"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "alkaline air"
}