"equilibrium vapor pressure" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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      ],
      "glosses": [
        "saturation vapor pressure"
      ],
      "id": "en-equilibrium_vapor_pressure-en-noun--lML1Qh-",
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        [
          "physics",
          "physics"
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        [
          "saturation vapor pressure",
          "saturation vapor pressure"
        ]
      ],
      "raw_glosses": [
        "(physics) saturation vapor pressure"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
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  ],
  "word": "equilibrium vapor pressure"
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    {
      "form": "equilibrium vapor pressures",
      "tags": [
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  "lang_code": "en",
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      "glosses": [
        "saturation vapor pressure"
      ],
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        [
          "saturation vapor pressure",
          "saturation vapor pressure"
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        "(physics) saturation vapor pressure"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
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  "word": "equilibrium vapor pressure"
}