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grinding
(Encyclopedia) grinding, process by which surface material is removed from an object, usually metal, by the abrasive action of a rotating wheel or a moving belt that contains abrasive grains. A…chalcedony
(Encyclopedia) chalcedonychalcedonykălsĕdˈənē [key] [from Chalcedon], form of quartz the crystals of which are so minute that its crystalline structure cannot be seen except with the aid of a…watch
(Encyclopedia) watch, small, portable timepiece usually designed to be worn on the person. Other kinds of timepieces are generally referred to as clocks. At one time it was generally believed that…Accurate Mechanical Clocks
Source: National Institute of Standards and Technology Physics Laboratory Pendulum ClocksQuartz Clocks In Europe during most of the Middle Ages (roughly 500 to 1500 A.D.), technological…gravel
(Encyclopedia) gravel, particles of rock, i.e., stones and pebbles, usually round in form and intermediate in size between sand grains and boulders. Gravel is composed of various kinds of rock, the…piezoelectric effect
(Encyclopedia) piezoelectric effectpiezoelectric effectpīēˌzōĭlĕkˈtrĭk [key], voltage produced between surfaces of a solid dielectric (nonconducting substance) when a mechanical stress is applied to…pitchblende
(Encyclopedia) pitchblendepitchblendepĭchˈblĕndˌ [key], dark, lustrous, heavy mineral, a source of radium and uranium. Largely natural uranium oxides, triuranium octaoxide (U3O8) and uranium dioxide…Glossary of Chemical Terms - Q
QA B C D E F G H I J K L M N O P Q R S T U V W X Y Z quanta Plural of quantum. quantum The minimum energy change of an atom emitting or absorbing energy. quartz An abundant mineral consisting…searchlight
(Encyclopedia) searchlight, device, usually swiveled, using a lens and reflecting surface to direct a powerful beam of light of nearly parallel rays. In 1892 such apparatus was used along the English…oscillator, electronic
(Encyclopedia) oscillator, electronicoscillator, electronicŏsˈəlāˌtər [key], electronic circuit that produces an output signal of a specific frequency. An oscillator generally consists of an…Trending
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