"Ehrenfest paradox" meaning in English

{
  "etymology_text": "Proposed in 1909 by Paul Ehrenfest.",
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      "glosses": [
        "A relativistic paradox concerning the concept of Born rigidity within special relativity, where an ideally rigid cylinder that is made to rotate about its axis of symmetry. The radius R as seen in the laboratory frame is always perpendicular to its motion and should therefore be equal to its value R₀ when stationary. However, the circumference should appear Lorentz-contracted to a smaller value than at rest. This leads to the contradiction that R = R₀ and R < R₀."
      ],
      "id": "en-Ehrenfest_paradox-en-name--2yu~aMC",
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        [
          "physics",
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          "relativistic",
          "relativistic"
        ],
        [
          "Born rigidity",
          "Born rigidity"
        ],
        [
          "special relativity",
          "special relativity"
        ],
        [
          "Lorentz-contracted",
          "Lorentz-Fitzgerald contraction"
        ]
      ],
      "raw_glosses": [
        "(physics) A relativistic paradox concerning the concept of Born rigidity within special relativity, where an ideally rigid cylinder that is made to rotate about its axis of symmetry. The radius R as seen in the laboratory frame is always perpendicular to its motion and should therefore be equal to its value R₀ when stationary. However, the circumference should appear Lorentz-contracted to a smaller value than at rest. This leads to the contradiction that R = R₀ and R < R₀."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "Paul Ehrenfest"
      ]
    }
  ],
  "word": "Ehrenfest paradox"
}

{
  "etymology_text": "Proposed in 1909 by Paul Ehrenfest.",
  "forms": [
    {
      "form": "the Ehrenfest paradox",
      "tags": [
        "canonical"
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      "glosses": [
        "A relativistic paradox concerning the concept of Born rigidity within special relativity, where an ideally rigid cylinder that is made to rotate about its axis of symmetry. The radius R as seen in the laboratory frame is always perpendicular to its motion and should therefore be equal to its value R₀ when stationary. However, the circumference should appear Lorentz-contracted to a smaller value than at rest. This leads to the contradiction that R = R₀ and R < R₀."
      ],
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          "physics",
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          "relativistic",
          "relativistic"
        ],
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          "Born rigidity",
          "Born rigidity"
        ],
        [
          "special relativity",
          "special relativity"
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          "Lorentz-contracted",
          "Lorentz-Fitzgerald contraction"
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      "raw_glosses": [
        "(physics) A relativistic paradox concerning the concept of Born rigidity within special relativity, where an ideally rigid cylinder that is made to rotate about its axis of symmetry. The radius R as seen in the laboratory frame is always perpendicular to its motion and should therefore be equal to its value R₀ when stationary. However, the circumference should appear Lorentz-contracted to a smaller value than at rest. This leads to the contradiction that R = R₀ and R < R₀."
      ],
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        "physical-sciences",
        "physics"
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      "wikipedia": [
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  "word": "Ehrenfest paradox"
}