# Specific Absorption Rate

SAR is amount of radiation which is absorbed by the human tissues while using the cell phones. When the SAR rate is very high it represents the radiation absorbed is also very high. This SAR value is usually measured in units of watts per kilogram (W/kg) in either 1 or 10 gram of tissue.

Calculate Specific Energy Absorption Rate (SAR) for Mobile Phones using the known values.

### Calculate Specific Absorption Rate for Mobile Phones

Conductivity of various human tissues
Siemens/m
RMS of electric intensity of the body
kg/m3
Density of human tissue

### Formula of Specific Absorption Rate:

SAR = (σ × Erms2) / ρ

• σ = Conductivity of various human tissues
• Erms = RMS of electric intensity of the body
• ρ = Density of human tissue

### Chart 1:

Learn the Electrical properties of different tissues in the body from the following chart.

Electrical properties of different tissues at 900 MHz
TissueErms (V/m)σ (S/m)ρ (kg/m3)
Skin39.50.691010
Bone17.40.191810
Brain45.80.761025

### Chart 2:

Learn the SAR value in the human head for different distance between human and antenna from the following chart.

Calculated SAR value in the human head for different values of D
Distance between
antenna and human head (D)
10 mm15 mm20 mm25 mm30 mm
SAR value (W/kg)9.96299.31309.01628.79068.1281
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