{
  "id": "glossary:sar",
  "collection": "glossary",
  "slug": "sar",
  "name": "SAR (specific absorption rate)",
  "summary": "Watts absorbed per kilogram of tissue, the dosimetric basis of phone compliance testing — 1.6 W/kg over 1 g in the U.S., 2 W/kg over 10 g under ICNIRP.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "definition": "SAR quantifies RF power deposition in tissue. It is measured in a liquid-filled phantom with the device transmitting at maximum power in its worst-case configuration, which is why a device's SAR is a compliance figure rather than a description of everyday exposure. Because the U.S. averages over 1 gram and ICNIRP over 10 grams, published SAR values for the same phone differ between regions and must not be compared directly.",
    "category": "measurement",
    "seeAlso": [
      "limits:fcc-sar-partial-body",
      "protocols:sar-lookup"
    ]
  },
  "sources": [
    {
      "id": "fcc-2-1093",
      "title": "47 CFR § 2.1093 — Radiofrequency radiation exposure evaluation: portable devices",
      "publisher": "U.S. Government Publishing Office (eCFR)",
      "url": "https://www.ecfr.gov/current/title-47/section-2.1093",
      "kind": "regulation",
      "retrieved": "2026-08-12"
    },
    {
      "id": "icnirp-2020",
      "title": "Guidelines for Limiting Exposure to Electromagnetic Fields (100 kHz to 300 GHz)",
      "publisher": "International Commission on Non-Ionizing Radiation Protection",
      "url": "https://www.icnirp.org/en/publications/article/rf-guidelines-2020.html",
      "year": 2020,
      "kind": "guideline",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/glossary/sar",
    "html": "https://emfbase.com/glossary/sar",
    "markdown": "https://emfbase.com/glossary/sar.md",
    "collection": "https://emfbase.com/api/glossary"
  }
}