Physics. The rate at which energy is absorbed in body tissues during exposures to radiofrequency electromagnetic fields in watt per kilogram (W/kg).
SAR can be measured and calculated for localized exposures (e.g., during use of a mobile phone) and whole body exposures (e.g., at a distance from a mobile base station). Basic restrictions in Germany are 0.08 W/kg for the exposure of the whole body and 2 W/kg of the partial body (averaged over 10 grams of body tissue).
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