Acoustic Acoustical
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Acoustic Acoustical
Containing, producing, arising from, actuated by, related
to, or associated with
sound.
Acoustic is used to modify terms that designate an object,
or physical characteristics, associated with sound waves; acoustical
is used when the term being qualified does not designate explicitly
something that has such properties, dimensions, or physical characteristics.
The following terms are examples of those modified by acoustic;
impedance, intertance, load (radiation field), output (sound power),
energy, wave, medium, signal, conduit, absorptivity, transducer.
The following examples do not have the requisite physical characteristics
and therefore take acoustical; society, method, engineer, school,
glossary, symbol, problem, measurement, point of view, device.
As illustrated, the generic term is usually modified by acoustical,
whereas the specific technical term calls for acoustic.
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use