base impurities

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• base bullion — noun Etymology: base (IV) : crude lead containing silver or gold and silver * * * Metall. smelted lead containing impurities, as gold, silver, or zinc, that are later removed. * * * base bullion, a base metal with appreciable amounts of a… …   Useful english dictionary

• base bullion — Metall. smelted lead containing impurities, as gold, silver, or zinc, that are later removed. * * * …   Universalium

• acid–base reaction — ▪ chemistry Introduction       a type of chemical process typified by the exchange of one or more hydrogen ions, H+, between species that may be neutral (molecules, such as water, H2O; or acetic acid, CH3CO2H) or electrically charged (ions, such… …   Universalium

• Film base — A film base is a transparent substrate which acts as a support medium for the photosensitive emulsion that lies atop it. Despite the numerous layers and coatings associated with the emulsion layer, the base generally accounts for the vast… …   Wikipedia

• Acid-base extraction — is a procedure using sequential liquid liquid extractions to purify acids and bases from mixtures based on their chemical properties. Acid base extraction is routinely performed during the work up after chemical syntheses and for the isolation of …   Wikipedia

• transistor — /tran zis teuhr/, n. 1. Electronics. a semiconductor device that amplifies, oscillates, or switches the flow of current between two terminals by varying the current or voltage between one of the terminals and a third: although much smaller in… …   Universalium

• metallurgy — metallurgic, metallurgical, adj. metallurgically, adv. metallurgist /met l err jist/ or, esp. Brit., /meuh tal euhr jist/, n. /met l err jee/ or, esp. Brit., /meuh tal euhr jee/, n. 1. the technique or science of working or heating metals so as… …   Universalium

• Flux (metallurgy) — Rosin used as flux for soldering A flux pen used f …   Wikipedia

• environmental works — ▪ civil engineering Introduction       infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations …   Universalium

• Semiconductor device — Semiconductor devices are electronic components that exploit the electronic properties of semiconductor materials, principally silicon, germanium, and gallium arsenide. Semiconductor devices have replaced thermionic devices (vacuum tubes) in most …   Wikipedia

• semiconductor device — ▪ electronics Introduction       electronic circuit component made from a material that is neither a good conductor nor a good insulator (hence semiconductor). Such devices have found wide applications because of their compactness, reliability,… …   Universalium