Non-SI units not formally adopted by the CGPM
| Name |
Symbol |
Quantity |
Equivalent SI unit |
| neper, field quantity |
Np |
ratio (dimensionless) |
LF = ln(F/F0) Np |
| neper, power quantity |
Np |
ratio (dimensionless) |
LP = 1⁄2ln(P/P0) Np |
| bel, field quantity |
B |
ratio (dimensionless) |
LF = 2 log10(F/F0) B |
| bel, power quantity |
B |
ratio (dimensionless) |
LP = log10(P/P0) B |
|
