ABSTRACT
Modern scientists and physicists believe that matter is composed of elementary particles, and in most of the scientific fields, it is not looked into the individual molecules, which is regarded as an entity of small but infinite dimensions interacting with its fellows according to certain laws. So matter is not continuous but discrete, and its gross properties are taken as averages over a large number of molecules. The equations of fluid motion have been formulated from this viewpoint, though they are considered at first sight as much more fundamental one. The average velocity of the molecules is taken in the neighborhood of a point, but how large this neighborhood should be is a questionable one.
