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 𝑃1 in reference to 𝑃2 is defined by the following formula:

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