Values of the constant of gravitation — ▪ Table Values of the constant of gravitation author year method G (in units of 10–11 m3s–2kg–1) H. Cavendish 1798 torsion balance (deflection) 6.754 J.H. Poynting 1891 common balance 6.698 C.V. Boys 1895 torsion balance (deflection) 6.658 C.… … Universalium
Mineral processing — Crushing, a form of comminution, one of the unit operations of mineral processing In the field of extractive metallurgy, mineral processing, also known as mineral dressing or ore dressing, is the process of separating commercially valuable… … Wikipedia
Tire code — Automobile tires are described by an alphanumeric tire code (in American English) or tyre code (in British English, Australian English and others), which is generally molded into the sidewall of the tire. This code specifies the dimensions of the … Wikipedia
Sensory deprivation — or perceptual isolation[1] is the deliberate reduction or removal of stimuli from one or more of the senses. Simple devices such as blindfolds or hoods and earmuffs can cut off sight and hearing respectively, while more complex devices can also… … Wikipedia
Architecture and Civil Engineering — ▪ 2009 Introduction Architecture For Notable Civil Engineering Projects in work or completed in 2008, see Table (Notable Civil Engineering Projects (in work or completed, 2008)). Beijing was the centre of the world of architecture… … Universalium
separation and purification — ▪ chemistry Introduction in chemistry, separation of a substance into its components and the removal of impurities. There are a large number of important applications in fields such as medicine and manufacturing. General principles… … Universalium
Nickel — This article is about the chemical element. For other uses, see Nickel (disambiguation). cobalt ← nickel → copper ↑ Ni ↓ Pd … Wikipedia
rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 … Universalium
Group 6 element — Group → 6 ↓ Period 4 24 Cr 5 … Wikipedia
Zinc — This article is about the metallic element. For other uses, see Zinc (disambiguation). copper ← zinc → gallium ↑ Zn ↓ Cd … Wikipedia
Molybdenum — niobium ← molybdenum → technetium Cr ↑ Mo ↓ W … Wikipedia