"Ehrenfest theorem" meaning in English

{
  "etymology_text": "Named after Paul Ehrenfest.",
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  "lang_code": "en",
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      "glosses": [
        "A theorem that relates the time derivative of the expectation values of the position and momentum operators x and p to the expectation value of the force F=-V'(x) on a massive particle moving in a scalar potential V(x)."
      ],
      "id": "en-Ehrenfest_theorem-en-name-x1zvy~Ix",
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      "raw_glosses": [
        "(physics) A theorem that relates the time derivative of the expectation values of the position and momentum operators x and p to the expectation value of the force F=-V'(x) on a massive particle moving in a scalar potential V(x)."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "Paul Ehrenfest"
      ]
    }
  ],
  "word": "Ehrenfest theorem"
}

{
  "etymology_text": "Named after Paul Ehrenfest.",
  "forms": [
    {
      "form": "the Ehrenfest theorem",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
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        "def": "1"
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      "expansion": "the Ehrenfest theorem",
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  "lang_code": "en",
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      "glosses": [
        "A theorem that relates the time derivative of the expectation values of the position and momentum operators x and p to the expectation value of the force F=-V'(x) on a massive particle moving in a scalar potential V(x)."
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "time",
          "time"
        ],
        [
          "derivative",
          "derivative"
        ]
      ],
      "raw_glosses": [
        "(physics) A theorem that relates the time derivative of the expectation values of the position and momentum operators x and p to the expectation value of the force F=-V'(x) on a massive particle moving in a scalar potential V(x)."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "Paul Ehrenfest"
      ]
    }
  ],
  "word": "Ehrenfest theorem"
}