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.
Laplace died in Paris, France, on March 5, 1827. He was 77 years old. It is impossible to overstate the influence Laplace had on the progress of the mathematical theory of mechanics. Various fundamental concepts, for instance the Laplace operator in potential theory and the Laplace transform in the study of differential equations, are named after him.