"filling gas" meaning in English

{
  "forms": [
    {
      "form": "filling gases",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "filling gas (countable and uncountable, plural filling gases)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "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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          "name": "Entries with translation boxes",
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          "source": "w"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with German translations",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Any nonreactive gas that is used to fill containers of perishable produce, tyres etc"
      ],
      "id": "en-filling_gas-en-noun-MHFMVtUn",
      "links": [
        [
          "nonreactive",
          "nonreactive"
        ],
        [
          "gas",
          "gas"
        ],
        [
          "fill",
          "fill"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "translations": [
        {
          "code": "de",
          "lang": "German",
          "sense": "Translations",
          "tags": [
            "neuter"
          ],
          "word": "Füllgas"
        }
      ]
    }
  ],
  "word": "filling gas"
}

{
  "forms": [
    {
      "form": "filling gases",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "filling gas (countable and uncountable, plural filling gases)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with German translations",
        "Translation table header lacks gloss"
      ],
      "glosses": [
        "Any nonreactive gas that is used to fill containers of perishable produce, tyres etc"
      ],
      "links": [
        [
          "nonreactive",
          "nonreactive"
        ],
        [
          "gas",
          "gas"
        ],
        [
          "fill",
          "fill"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "translations": [
    {
      "code": "de",
      "lang": "German",
      "sense": "Translations",
      "tags": [
        "neuter"
      ],
      "word": "Füllgas"
    }
  ],
  "word": "filling gas"
}