You might be most familiar with sonography's role in the field of obstetrics to produce an ultrasound image of an unborn baby. Sonography is also used to analyze tissues and organs of the body, such as the heart, eyes and abdomen.
Etymology: Pierre S. de Laplace, French physicist, 1749-1827. a principle of physics that the tension on the wall of a sphere is the product of the pressure times the radius of the chamber and the tension is inversely related to the thickness of the wall.
Slide 4 of 14. Notes: Generally speaking, Hookes Law is an approximation to the way all elastic forces behave when strains are very small. This slide talks about elastic limit for tensile strains in a wire, but the same principle works for any kind of stress. A paper clip, for example, springs back into its original shape unless it is bent beyond an elastic limit where the stain becomes permanent.