Density


 * Reference for term: Musculoskeletal ultrasound - Holsbeeck Van, M. et al.
 * Technical definition: Physical parameter that describes the mass of a medium per unit volume
 * Reference for definition: Ultrasound Physics and Instrumentation - Hedrick, W. et al.
 * Comment: The speed of sound is inversely proportional to the square root of density of the medium.