distance apart
81fluid mechanics — an applied science dealing with the basic principles of gaseous and liquid matter. Cf. fluid dynamics. [1940 45] * * * Study of the effects of forces and energy on liquids and gases. One branch of the field, hydrostatics, deals with fluids at… …
82History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… …
83Nuclear binding energy — is the energy required to split a nucleus of an atom into its component parts. The component parts are neutrons and protons, which are collectively called nucleons. If the binding energy for the products is higher when light nuclei fuse, or when… …
84geometry — /jee om i tree/, n. 1. the branch of mathematics that deals with the deduction of the properties, measurement, and relationships of points, lines, angles, and figures in space from their defining conditions by means of certain assumed properties… …
85Procedural control — is a method of providing air traffic control services without the use of radar. It is used in regions of the world, specifically sparsely populated land areas and oceans, where provision of contiguous radar cover is either prohibitively expensive …
86Railroad switch — For other uses, see Switch (disambiguation). A right hand railroad switch with point indicator pointing to right …
87Stereoscopy — Stereoscopy, stereoscopic imaging or 3 D (three dimensional) imaging is any technique capable of recording three dimensional visual information or creating the illusion of depth in an image. The illusion of depth in a photograph, movie, or other… …
88Stereophonic sound — Stereophonic sound, commonly called stereo, is the reproduction of sound, using two or more independent audio channels, through a symmetrical configuration of loudspeakers, in such a way as to create a pleasant and natural impression of sound… …
89Born-Landé equation — The Born Landé equation is a means of calculating the lattice energy of a crystalline ionic compound. In 1918 [ I.D. Brown, The chemical Bond in Inorganic Chemistry , IUCr monographs in crystallography, Oxford University Press, 2002, ISBN… …
90Crown graph — Crown graphs with six, eight, and ten vertices. In graph theory, a branch of mathematics, a crown graph on 2n vertices is an undirected graph with two sets of vertices ui and vi and with an edge from ui to vj whenever i ≠ j. The crown… …
