bel
UK[bɛl]US[bɛl]
n
A unit for comparing the intensity of sounds or the power of electrical signals, equal to ten decibels.
Etymology
The term 'bel' is a modern scientific coinage, derived from the surname of Alexander Graham Bell, the renowned Scottish-born inventor and engineer who pioneered work in acoustics and telecommunications. It was created in the early 20th century within the Bell Telephone Laboratories to provide a logarithmic unit for measuring sound intensity and electrical power ratios. As a tribute, his name was shortened to 'bel', establishing a direct and lasting link between his legacy and the fundamental units of acoustic and electronic measurement.
Analysis
The word 'bel' is a simplex unit named after a person. It does not contain separable morphemes in the modern English spelling.
Examples
The noise level was measured at three bels above the threshold of hearing.
In telecommunications, signal strength is often expressed in bels or decibels.
A gain of one bel represents a tenfold increase in power.