air quenching
121Epicureanism — Stephen Everson It is tempting to portray Epicureanism as the most straightforward, perhaps even simplistic, of the major dogmatic philosophical schools of the Hellenistic age. Starting from an atomic physics, according to which ‘the totality of… …
122Cryogenics — For cryopreservation/resuscitation, see Cryonics. For the band, see Cryogenic (band). In physics, cryogenics is the study of the production of very low temperature (below −150 °C, −238 °F or 123 K) and the behavior of materials at those… …
123Iron ore — Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, deep purple, to rusty red. The iron itself is usually found in the …
124River Don, South Yorkshire — River Don The River Don as it flows past Hillsborough Stadium. Origin Pennines …
125Radical (chemistry) — Free radical redirects here. For other uses, see Free radical (disambiguation). Moses Gomberg (1866 1947), the founder of radical chemistry Radicals (often referred to as free radicals) are atoms, molecules, or ions with unpaired electrons on an… …
126Induction coil — An induction coil or spark coil (archaically known as a Ruhmkorff coil) is a type of disruptive discharge coil. It is a type of electrical transformer used to produce high voltage pulses from a low voltage DC supply. To create the flux changes… …
127Photochemistry — Photochemistry, a sub discipline of chemistry, is the study of chemical reactions that proceed with the absorption of light by atoms or molecules.[1]. Everyday examples include photosynthesis, the degradation of plastics and the formation of… …
128Carbon steel — Iron alloy phases Ferrite (α iron, δ iron) Austenite (γ iron) Pearlite (88% ferrite, 12% cementite) …
