Specific absorption rate

Specific absorption rate (SAR) is a measure of the rate at which radio frequency (RF) energy is absorbed by the body when exposed to radio-frequency electromagnetic field. The most common use is in relation to mobile phones. Various governments have defined safety limits for exposure to RF energy produced by mobile devices:

• United States: the FCC requires that phones sold have a SAR level at or below 1.6 watts per kilogram (W/kg) taken over a volume of 1 gram of tissue.
• European Union: the SAR limit is 2 W/kg, averaged over ten grams of tissue.

See also

• Mobile phone radiation and health
• Electromagnetic radiation and health