insoluble residues

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• mineral deposit — Introduction       aggregate of a mineral in an unusually high concentration.       About half of the known chemical elements (chemical element) possess some metallic (metal) properties. The term metal, however, is reserved for those chemical… …   Universalium

• iridium — /i rid ee euhm, uy rid /, n. Chem. a precious metallic element resembling platinum: used in platinum alloys and for the points of gold pens. Symbol: Ir; at. wt.: 192.2; at. no.: 77; sp. gr.: 22.4 at 20°C. [1804; < L irid , s. of iris rainbow (see …   Universalium

• karst — karstic, adj. /kahrst/, n. Geol. an area of limestone terrane characterized by sinks, ravines, and underground streams. [1900 05; < G, generic use of Karst, name of limestone plateau north of Trieste] * * * ▪ geology       terrain usually… …   Universalium

• 1804 in science — The year 1804 in science and technology involved some significant events, listed below.ChemistryThe drug morphine is isolated, and many elements are discovered, including cerium, iridium, osmium, palladium, and rhodium: * William Hyde Wollaston… …   Wikipedia

• 1804 in archaeology — The year 1804 in archaeology involved some significant events.ExplorationsExcavations* In southern France, the Ratapignata Pyramid ( Aven de Ratapignata ) is discovered on the hillside north of Nice, France and northwest of Falicon. It was… …   Wikipedia

• Cone-in-cone structures — in limestone. Cone in cone structures are secondary sedimentary structures that form in association with deeper burial and diagenesis. They consist of concentric inter bedded cones of calcite or more rarely gypsum, siderite or pyrite …   Wikipedia

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

• protein — proteinaceous /proh tee nay sheuhs, tee i nay /, proteinic, proteinous, adj. /proh teen, tee in/, n. 1. Biochem. any of numerous, highly varied organic molecules constituting a large portion of the mass of every life form and necessary in the… …   Universalium

• cell — cell1 cell like, adj. /sel/, n. 1. a small room, as in a convent or prison. 2. any of various small compartments or bounded areas forming part of a whole. 3. a small group acting as a unit within a larger organization: a local cell of the… …   Universalium

• Dry cleaning — (or dry cleaning) is any cleaning process for clothing and textiles using a chemical solvent other than water. The solvent used is typically tetrachloroethylene (perchloroethylene), abbreviated perc in the industry and dry cleaning fluid by the… …   Wikipedia

• wood — wood1 woodless, adj. /wood/, n. 1. the hard, fibrous substance composing most of the stem and branches of a tree or shrub, and lying beneath the bark; the xylem. 2. the trunks or main stems of trees as suitable for architectural and other… …   Universalium