"bulk viscosity" meaning in English

{
  "forms": [
    {
      "form": "bulk viscosities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "bulk viscosity (countable and uncountable, plural bulk viscosities)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "95 5",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w+disamb"
        },
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          "_dis": "95 5",
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
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          "source": "w+disamb"
        },
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          "_dis": "95 5",
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "88 12",
          "kind": "other",
          "langcode": "en",
          "name": "Physical quantities",
          "orig": "en:Physical quantities",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "resistance to expansion and contraction by a fluid"
      ],
      "hyponyms": [
        {
          "_dis1": "100 0",
          "word": "cosmological viscosity"
        }
      ],
      "id": "en-bulk_viscosity-en-noun--L-QLdan",
      "raw_glosses": [
        "(uncountable) resistance to expansion and contraction by a fluid"
      ],
      "related": [
        {
          "_dis1": "100 0",
          "word": "shear viscosity"
        },
        {
          "_dis1": "100 0",
          "word": "microviscosity"
        }
      ],
      "tags": [
        "uncountable"
      ]
    },
    {
      "categories": [],
      "glosses": [
        "the measure of such"
      ],
      "id": "en-bulk_viscosity-en-noun-Z8gqhFF8",
      "raw_glosses": [
        "(countable) the measure of such"
      ],
      "tags": [
        "countable"
      ]
    }
  ],
  "word": "bulk viscosity"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English entries with topic categories using raw markup",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English terms with non-redundant non-automated sortkeys",
    "English uncountable nouns",
    "en:Physical quantities"
  ],
  "forms": [
    {
      "form": "bulk viscosities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "bulk viscosity (countable and uncountable, plural bulk viscosities)",
      "name": "en-noun"
    }
  ],
  "hyponyms": [
    {
      "word": "cosmological viscosity"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "shear viscosity"
    },
    {
      "word": "microviscosity"
    }
  ],
  "senses": [
    {
      "categories": [
        "English uncountable nouns"
      ],
      "glosses": [
        "resistance to expansion and contraction by a fluid"
      ],
      "raw_glosses": [
        "(uncountable) resistance to expansion and contraction by a fluid"
      ],
      "tags": [
        "uncountable"
      ]
    },
    {
      "categories": [
        "English countable nouns"
      ],
      "glosses": [
        "the measure of such"
      ],
      "raw_glosses": [
        "(countable) the measure of such"
      ],
      "tags": [
        "countable"
      ]
    }
  ],
  "word": "bulk viscosity"
}