#sound_unit__soundunit  any acoustic unit of measurement
  supertype:  #unit_of_measurement  #sound.mechanical_phenomenon (pm)
  subtype:  #bel__B  a logarithmic unit of sound intensity equal to 10 decibels
  subtype:  #decibel__dB__db__db  a logarithmic unit of sound intensity; 10 times the logarithm of the ratio of the sound intensity to some reference intensity
  subtype:  #sone  a unit of perceived loudness equal to the loudness of a 1000-hertz tone at 40 dB above threshold
  subtype:  #phon  a unit of subjective loudness

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