"Avogadro's law" meaning in English

{
  "etymology_text": "Proposed by Italian chemist Amedeo Avogadro.",
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  "lang_code": "en",
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      "glosses": [
        "A gas law stating that when held at constant pressure and temperature, the volume of a gas is proportional to the amount of molecules in it (now subsumed by the ideal gas law)."
      ],
      "id": "en-Avogadro's_law-en-name-nBhWnWn8",
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          "physical chemistry",
          "physical chemistry"
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        [
          "gas law",
          "gas law"
        ],
        [
          "pressure",
          "pressure"
        ],
        [
          "temperature",
          "temperature"
        ],
        [
          "volume",
          "volume"
        ],
        [
          "proportional",
          "proportional"
        ],
        [
          "molecule",
          "molecule"
        ],
        [
          "ideal gas law",
          "ideal gas law"
        ]
      ],
      "raw_glosses": [
        "(physical chemistry, historical) A gas law stating that when held at constant pressure and temperature, the volume of a gas is proportional to the amount of molecules in it (now subsumed by the ideal gas law)."
      ],
      "tags": [
        "historical",
        "physical"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "Amedeo Avogadro",
        "Avogadro's law"
      ]
    }
  ],
  "word": "Avogadro's law"
}

{
  "etymology_text": "Proposed by Italian chemist Amedeo Avogadro.",
  "head_templates": [
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  "lang_code": "en",
  "pos": "name",
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        "en:Physical chemistry"
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      "glosses": [
        "A gas law stating that when held at constant pressure and temperature, the volume of a gas is proportional to the amount of molecules in it (now subsumed by the ideal gas law)."
      ],
      "links": [
        [
          "physical chemistry",
          "physical chemistry"
        ],
        [
          "gas law",
          "gas law"
        ],
        [
          "pressure",
          "pressure"
        ],
        [
          "temperature",
          "temperature"
        ],
        [
          "volume",
          "volume"
        ],
        [
          "proportional",
          "proportional"
        ],
        [
          "molecule",
          "molecule"
        ],
        [
          "ideal gas law",
          "ideal gas law"
        ]
      ],
      "raw_glosses": [
        "(physical chemistry, historical) A gas law stating that when held at constant pressure and temperature, the volume of a gas is proportional to the amount of molecules in it (now subsumed by the ideal gas law)."
      ],
      "tags": [
        "historical",
        "physical"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "Amedeo Avogadro",
        "Avogadro's law"
      ]
    }
  ],
  "word": "Avogadro's law"
}