atomic packing

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• Atomic packing factor — In crystallography, atomic packing factor (APF) or packing fraction is the fraction of volume in a crystal structure that is occupied by atoms. It is dimensionless and always less than unity. For practical purposes, the APF of a crystal structure …   Wikipedia

• Atomic packing factor — Compacité (cristallographie) Pour les articles homonymes, voir Compacité. En cristallographie, la compacité (ou taux de remplissage) d un édifice cristallin, dans le modèle des sphères dures, est le rapport du volume total des sphères d une… …   Wikipédia en Français

• atomic packing factor — the fraction of the volume of a unit cell that is occupied by hard sphere atoms or ions …   Mechanics glossary

• packing fraction — n. the ratio of the mass defect of an isotope to its mass number, equal to (M − A) ÷ A, where M is the atomic mass and A is the mass number: usually expressed as parts per 10,000 …   English World dictionary

• Atomic nucleus — A figurative depiction of the helium 4 atom with the electron cloud in shades of gray. In the nucleus, the two protons and two neutrons are depicted in red and blue. This depiction shows the particles as separate, whereas in an actual helium atom …   Wikipedia

• packing fraction — noun : a measure of the loss or gain of total mass in a group of nucleons when they are brought together to form an atomic nucleus : the ratio multiplied by 10,000 of the mass defect to the mass number * * * Physics. a measure of the stability of …   Useful english dictionary

• packing fraction — Physics. a measure of the stability of an atomic nucleus, equal to 104 multiplied by the mass defect and divided by the mass number. [1925 30] * * * …   Universalium

• packing house — Synonyms and related words: armory, arsenal, assembly line, assembly plant, atomic energy plant, bindery, boatyard, boilery, bookbindery, brewery, brickyard, cannery, creamery, dairy, defense plant, distillery, dockyard, factory, factory belt,… …   Moby Thesaurus

• packing fraction — /ˈpækɪŋ frækʃən/ (say paking frakshuhn) noun 1. the difference between the mass of an isotope on the physical scale of atomic weights, and its mass number, divided by the mass number; often multiplied by 10 000 for convenience. 2. the fractional… …  

• Close-packing of spheres — hcp and fcc close packing of spheres In geometry, close packing of spheres is a dense arrangement of equal spheres in an infinite, regular arrangement (or lattice). Carl Friedrich Gauss proved that the highest average density – that is, the… …   Wikipedia

• factor — atomic packing factor radiation view factor radiation shape factor relative magnification factor stress intensity factor …   Mechanics glossary