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Bels (b) Enhedsdefinition
The bel (B) is a unit used to measure a given sound level. The term is derived from the name of Alexander Graham Bell the inventor of the telephone. It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel (dB) have a power ratio of 101⁄10 (approximately 1.26) or root-power ratio of 101⁄20 (approximately 1.12).
SI Multiples
A table of various sound level bel units derived from SI multiples:
Submultiples |
Multiples |
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Scientific Notation |
Værdi |
Præfiks |
Navn |
Scientific Notation |
Værdi |
Præfiks |
Navn |
10-1 B |
0.1 B |
Deci (d) | Decibel (DB) | 101 B |
10 B |
Deca (DA) | Decabels (DAB) |
10-2 B |
0.01 B |
Centi (c) | Centibel (CB) | 102 B |
100 B |
Hekto (H) | Hectobels (HB) |
10-3 B |
0.001 B |
Milli (M) | Millibel (MB) | 103 B |
1000 B |
Kilo (k) | Kilobels (KB) |
10-6 B |
0.000001 B |
Mikro (µ) | Mikrobeller (µb) | 106 B |
1000000 B |
Mega (M) | Megabels (MB) |
10-9 B |
0.000000001 B |
Nano (n) | Nanobels (NB) | 109 B |
1000000000 B |
Giga (g) | Gigabels (GB) |
10-12 B |
0.000000000001 B |
Pico (P) | Picobels (PB) | 1012 B |
1000000000000 B |
Tera (t) | Terabels (TB) |
10-15 B |
0.000000000000001 B |
Femto (f) | Femtobels (fB) | 1015 B |
1000000000000000 B |
PETA (P) | Petabels (PB) |
10-18 B |
0.000000000000000001 B |
Atto (a) | Attobels (AB) | 1018 B |
1000000000000000000 B |
Exa (e) | Exabels (EB) |
10-21 B |
0.000000000000000000001 B |
Zepto (Z) | Zeptobels (ZB) | 1021 B |
1000000000000000000000 B |
Zetta (Z) | Zettabels (ZB) |
10-24 B |
0.000000000000000000000001 B |
Yocto (Y) | Yoctobels (YB) | 1024 B |
1000000000000000000000000 B |
Yotta (Y) | Yottabels (YB) |
10-27 B |
0.000000000000000000000000001 B |
Ronto (r) | Rontobels (rB) | 1027 B |
1000000000000000000000000000 B |
Ronna (R) | Ronnabels (RB) |
10-30 B |
0.000000000000000000000000000001 B |
Quecto (q) | Quectobels (qB) | 1030 B |
1000000000000000000000000000000 B |
Quetta (Q) | Quettabels (QB) |
Other Sound Level Unit Definitions
- Attobels (AB)
- AttonePers (ANP)
- Bels (b)
- Centibel (CB)
- CentinePers (CNP)
- Decabels (DAB)
- Decanepers (DANP)
- Decibel (DB)
- Decinepers (DNP)
- Dekabels (daB)
- Dekanepers (daNp)
- Exabels (EB)
- Exanepers (ENP)
- Femtobels (fB)
- Femtonepers (FNP)
- Gigabels (GB)
- Giganepers (BNI)
- Hectobels (HB)
- HectonePers (HNP)
- Kilobels (KB)
- Kilonepers (KNP)
- Megabels (MB)
- Meganepers (MNP)
- Mikrobeller (µb)
- Mikronepers (µnp)
- Millibel (MB)
- Millinepers (MNP)
- Nanobels (NB)
- Nanonepers (NNP)
- NEPERS (NP)
- Petabels (PB)
- Petanepers (PNP)
- Picobels (PB)
- Piconepers (PNP)
- Quectobels (qB)
- Quectonepers (qNp)
- Quettabels (QB)
- Quettanepers (QNp)
- Ronnabels (RB)
- Ronnanepers (RNp)
- Rontobels (rB)
- Rontonepers (rNp)
- Terabels (TB)
- Teranepers (TNP)
- Yoctobels (YB)
- Yoctonepers (YNP)
- Yottabels (YB)
- Yottanepers (YNP)
- Zeptobels (ZB)
- ZeptonPers (ZNP)
- Zettabels (ZB)
- Zettanepers (ZNP)
Convert to Another Sound Level Unit
Relaterede definitioner
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Kilder
“Decibel.” Wikipedia, Wikimedia Foundation, 3 Sept. 2023, en.wikipedia.org/wiki/Decibel.