pure+silica
51pebble — n. 1. Stone (of small size), pebble stone. 2. (In jewelry.) Agate. 3. (Among opticians.) Colorless rock crystal, quartz, pure silica …
52flint — ► NOUN 1) a hard grey rock consisting of nearly pure silica, occurring chiefly as nodules in chalk. 2) a piece of this rock. 3) a piece of flint or an alloy used with steel to produce an igniting spark, especially in a cigarette lighter. ORIGIN… …
53Mohs scale — [mōz] n. [after F. Mohs (1773 1839), Ger mineralogist] Mineralogy 1. an arbitrary scale used to indicate relative hardness, arranged in 10 ascending degrees: 1, talc; 2, gypsum; 3, calcite; 4, fluorite; 5, apatite; 6, orthoclase; 7, quartz; 8,… …
54Desiccant — Silica gel A desiccant is a hygroscopic substance that induces or sustains a state of dryness (desiccation) in its local vicinity in a moderately well sealed container. Commonly encountered pre packaged desiccants are solids, and work through… …
55hydrosphere — /huy dreuh sfear /, n. the water on or surrounding the surface of the globe, including the water of the oceans and the water in the atmosphere. [1885 90; HYDRO 1 + SPHERE] * * * Discontinuous layer of water at or near the Earth s surface. It… …
56amorphous solid — ▪ physics Introduction any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel. Solids and liquids (liquid) are both forms of condensed… …
57steel — steellike, adj. /steel/, n. 1. any of various modified forms of iron, artificially produced, having a carbon content less than that of pig iron and more than that of wrought iron, and having qualities of hardness, elasticity, and strength varying …
58chromium processing — Introduction preparation of the ore for use in various products. Chromium (Cr) is a brilliant, hard, refractory metal that melts at 1,857° C (3,375° F) and boils at 2,672° C (4,842° F). In the pure state, it is resistant to ordinary… …
59industrial glass — Introduction solid material that is normally lustrous and transparent in appearance and that shows great durability under exposure to the natural elements. These three properties lustre, transparency, and durability make glass a favoured… …
60chemical element — Introduction also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed. This article considers the… …
