"W/m⋅K" meaning in Conventions internationales

{
  "categories": [
    {
      "kind": "other",
      "name": "Symboles en conventions internationales",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Conventions internationales",
      "orig": "conventions internationales",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "alt_of": [
        {
          "word": "W⋅m⁻¹⋅K⁻¹"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en conventions internationales",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Exemples en conventions internationales à traduire",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Lexique en conventions internationales de la métrologie",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Pierre Trambouze et Jean-Paul Euzen, Les réacteurs chimiques : de la conception à la mise en œuvre, 2002,ISBN 2-7108-0816-1",
          "text": "λₑ conductivité thermique de la particule (W/m⋅K)"
        }
      ],
      "glosses": [
        "Variante de W⋅m⁻¹⋅K⁻¹. Symbole du watt par mètre-kelvin."
      ],
      "id": "fr-W/m⋅K-conv-symbol-LrTjYGsp",
      "tags": [
        "alt-of"
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "word": "W/m⋅K"
}

{
  "categories": [
    "Symboles en conventions internationales",
    "conventions internationales"
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "alt_of": [
        {
          "word": "W⋅m⁻¹⋅K⁻¹"
        }
      ],
      "categories": [
        "Exemples en conventions internationales",
        "Exemples en conventions internationales à traduire",
        "Lexique en conventions internationales de la métrologie"
      ],
      "examples": [
        {
          "ref": "Pierre Trambouze et Jean-Paul Euzen, Les réacteurs chimiques : de la conception à la mise en œuvre, 2002,ISBN 2-7108-0816-1",
          "text": "λₑ conductivité thermique de la particule (W/m⋅K)"
        }
      ],
      "glosses": [
        "Variante de W⋅m⁻¹⋅K⁻¹. Symbole du watt par mètre-kelvin."
      ],
      "tags": [
        "alt-of"
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "word": "W/m⋅K"
}