"mass fraction" meaning in English

{
  "forms": [
    {
      "form": "mass fractions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mass fraction (plural mass fractions)",
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  "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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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Chemistry",
          "orig": "en:Chemistry",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The fractional proportion of a substance in a mixture, by weight/mass."
      ],
      "id": "en-mass_fraction-en-noun-eNtsyVlQ",
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "proportion",
          "proportion"
        ],
        [
          "substance",
          "substance"
        ],
        [
          "mixture",
          "mixture"
        ],
        [
          "weight",
          "weight"
        ],
        [
          "mass",
          "mass"
        ]
      ],
      "raw_glosses": [
        "(chemistry) The fractional proportion of a substance in a mixture, by weight/mass."
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Translations",
          "word": "massaosuus"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "Translations",
          "tags": [
            "masculine"
          ],
          "word": "Massenanteil"
        },
        {
          "code": "ro",
          "lang": "Romanian",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "fracție masică"
        }
      ],
      "wikipedia": [
        "Mass fraction (chemistry)"
      ]
    }
  ],
  "word": "mass fraction"
}

{
  "forms": [
    {
      "form": "mass fractions",
      "tags": [
        "plural"
      ]
    }
  ],
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      "expansion": "mass fraction (plural mass fractions)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English countable nouns",
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        "en:Chemistry"
      ],
      "glosses": [
        "The fractional proportion of a substance in a mixture, by weight/mass."
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "proportion",
          "proportion"
        ],
        [
          "substance",
          "substance"
        ],
        [
          "mixture",
          "mixture"
        ],
        [
          "weight",
          "weight"
        ],
        [
          "mass",
          "mass"
        ]
      ],
      "raw_glosses": [
        "(chemistry) The fractional proportion of a substance in a mixture, by weight/mass."
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "Mass fraction (chemistry)"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Translations",
      "word": "massaosuus"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "Translations",
      "tags": [
        "masculine"
      ],
      "word": "Massenanteil"
    },
    {
      "code": "ro",
      "lang": "Romanian",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "fracție masică"
    }
  ],
  "word": "mass fraction"
}