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1) Decibels are often used to express ratios of two
physical quantities (expressed in the same units).
For example, currents, pressures and voltages.
2) When we say "a length of a corridor is 20 meters"
we are referring to a ratio of two lengths, that of
the corridor and that of a stick, our secondary
standard of length. Why don't we add "radians,"
"decibels" or "machs?" Because this would not
be useful.