Bel (B)
- 1 unit of bel represented the ratio of 10 to 1 (Thus a power ratio of 10:1 = 1 bel, 100:1 = 2 bels, and 1000:1 = 3 bels)
- was named after Alexander Graham Bell
B - Formula
The bel of π1 in reference to π2 is defined by the following formula: