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| Symbol: | B (power) |
| Category: | Logarithm of a ratio |
| SI Equivalent: | 10 dB |
| Dimension: | nil (log) |
| Notes | |
| Named after the telephone inventor, Alexander Graham Bell (1847-1922), the bel is a unit for expressing the ratio between two amounts of acoustic power. It is defined as log10P1/P2. | |
| Logarithm of a ratio | ||
| Symbol | Unit Name | |
| 2 | B (voltage) | bel (voltage) |
| 10 | dB (power) | decibel (power) |
| 20 | dB (voltage) | decibel (voltage) |
| 2.30259 | NP | neper |
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