"cascade method" meaning in English

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  "lang": "English",
  "lang_code": "en",
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          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
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      "glosses": [
        "A method of attaining successively lower temperatures by using the cooling effect of the expansion of one gas in condensing another less easily liquefiable, and so on."
      ],
      "id": "en-cascade_method-en-name-wjX2yq1E",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "temperature",
          "temperature"
        ],
        [
          "cool",
          "cool"
        ],
        [
          "expansion",
          "expansion"
        ],
        [
          "gas",
          "gas"
        ],
        [
          "condensing",
          "condense"
        ],
        [
          "liquefiable",
          "liquefiable"
        ]
      ],
      "raw_glosses": [
        "(physics) A method of attaining successively lower temperatures by using the cooling effect of the expansion of one gas in condensing another less easily liquefiable, and so on."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "cascade method"
}

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      "expansion": "cascade method",
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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    {
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        "en:Physics"
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      "glosses": [
        "A method of attaining successively lower temperatures by using the cooling effect of the expansion of one gas in condensing another less easily liquefiable, and so on."
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "temperature",
          "temperature"
        ],
        [
          "cool",
          "cool"
        ],
        [
          "expansion",
          "expansion"
        ],
        [
          "gas",
          "gas"
        ],
        [
          "condensing",
          "condense"
        ],
        [
          "liquefiable",
          "liquefiable"
        ]
      ],
      "raw_glosses": [
        "(physics) A method of attaining successively lower temperatures by using the cooling effect of the expansion of one gas in condensing another less easily liquefiable, and so on."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "cascade method"
}