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Acoustical engineering
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===Ultrasonics=== {{main|Ultrasound}} [[File:CRL Crown rump length 12 weeks ecografia Dr. Wolfgang Moroder.jpg|thumb|right|Ultrasound image of a fetus in the womb, viewed at 12 weeks of pregnancy (bidimensional-scan)]]Ultrasonics deals with sound waves in solids, liquids and gases at frequencies too high to be heard by the average person. Specialist areas include medical ultrasonics (including [[medical ultrasonography]]), [[sonochemistry]], [[nondestructive testing]], material characterisation and [[underwater acoustics]] ([[sonar]]).<ref>{{cite book|last=Ensminger|first=Dale|title=Ultrasonics: Fundamentals, Technologies, and Applications|year=2012|publisher=CRC Press|pages=1β2}}</ref>
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