"Balmer formula" meaning in English

{
  "etymology_text": "For Johann Jakob Balmer, Swiss mathematician, who discovered it in 1885.",
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  "lang_code": "en",
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      "glosses": [
        "The empirical equation used to calculate the Balmer series."
      ],
      "id": "en-Balmer_formula-en-name-y2zUCjUy",
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          "Balmer series"
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      "wikipedia": [
        "Johann Jakob Balmer"
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  "word": "Balmer formula"
}

{
  "etymology_text": "For Johann Jakob Balmer, Swiss mathematician, who discovered it in 1885.",
  "forms": [
    {
      "form": "the Balmer formula",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
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      },
      "expansion": "the Balmer formula",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
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        "English entries with language name categories using raw markup",
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      ],
      "glosses": [
        "The empirical equation used to calculate the Balmer series."
      ],
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          "empirical"
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  "word": "Balmer formula"
}