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bel (B)

A unit of measure of ratios of power levels, i.e., relative power levels. Note 1: The number of bels for a given ratio of power levels is calculated by taking the logarithm, to the base 10, of the ratio. Mathematically, the number of bels is calculated as B = log_{10}(P_{1}/P_{2}) where P_{1} and P_{2} are power levels. Note 2: The dB, equal to 0.1 B, is a more commonly used unit. 

