Z=rc
c (m/s) Z 106 kg/m2/s
Air 344 0.0004
Water 1484 1.48
Blood 1550 1.61
Myocardium 1550 1.62 (perpendicular to fibers)
Muscle 1580 1.64
Liver 1570 1.65
Kidney 1560 1.62
Fat 1450 1.38
Skull Bone 3360 5.69 (compressive)
r=1.78 gm/cm3, Y= 1.8x108 N/m2
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