Bel

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Bel

The fundamental division of a logarithmic scale for expressing the ratio of two amounts of power, the number of bels denoting such a ratio being the logarithm to the base 10 of this ratio.
With <math>P₁ and P₂ designating two amounts of power and N the number of bels denoting their ratio, N = log₁₀ (P₁/P₂) bels.<math>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use