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You may have had an ultrasound before, and wondered what that gel does. Well, that weird alien goop has a purpose, and it has to do with being like our weird human skin.
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Sources:
General Ultrasound
teachersinstitu...
courses.washing...
www.physics.uto...
Ultrasound Gel
www.two-views.c...
healdove.com/h...
Acoustic Impedance
www.schoolphysi...
Images:
Sound Wave Diagram: commons.wikime...