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.
MOST OF US REMEMBER being exposed to the Law of Laplace in a physiology course and, with a little effort, associate it with the pulmonary system and alveolar function. Some of us remember that the Law associates the tension (T) in the walls of a container with its radius (R) and the pressure (P) of its contents.