"Cassie equation" meaning in English

{
  "etymology_text": "Named after A. B. D. Cassie.",
  "forms": [
    {
      "form": "the Cassie equation",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "def": "1"
      },
      "expansion": "the Cassie equation",
      "name": "en-prop"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "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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          "parents": [
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          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
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      ],
      "glosses": [
        "An equation describing the effective contact angle for a liquid on a chemically heterogeneous surface."
      ],
      "id": "en-Cassie_equation-en-name-rGE3-fQE",
      "links": [
        [
          "liquid",
          "liquid"
        ],
        [
          "heterogeneous",
          "heterogeneous"
        ],
        [
          "surface",
          "surface"
        ]
      ],
      "related": [
        {
          "word": "Cassie-Baxter equation"
        },
        {
          "word": "Cassie-Baxter state"
        },
        {
          "word": "Cassie's law"
        }
      ]
    }
  ],
  "word": "Cassie equation"
}

{
  "etymology_text": "Named after A. B. D. Cassie.",
  "forms": [
    {
      "form": "the Cassie equation",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "def": "1"
      },
      "expansion": "the Cassie equation",
      "name": "en-prop"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "related": [
    {
      "word": "Cassie-Baxter equation"
    },
    {
      "word": "Cassie-Baxter state"
    },
    {
      "word": "Cassie's law"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English proper nouns",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns"
      ],
      "glosses": [
        "An equation describing the effective contact angle for a liquid on a chemically heterogeneous surface."
      ],
      "links": [
        [
          "liquid",
          "liquid"
        ],
        [
          "heterogeneous",
          "heterogeneous"
        ],
        [
          "surface",
          "surface"
        ]
      ]
    }
  ],
  "word": "Cassie equation"
}