Sandpapers Sandpapers (coated abrasive) are the next most significant abrasive product. They consist, basically, of…

Animal communication Animal communication, process by which one animal provides information that other animals can incorporate into…

Broadband-light sources Although flames and discharges provide a convenient method of excitation, the environment can strongly perturb…

Spectroscopy also provides a precise analytical method for finding the constituents in material having unknown chemical composition. In a typical…

Matte, crude mixture of molten sulfides formed as an intermediate product of the smelting of sulfide ores of metals,…

Smelting, process by which a metal is obtained, either as the element or as a simple compound, from…

Stone Age, prehistoric cultural stage, or level of human development characterized by the creation and use of stone tools.…

Silver (Ag), chemical element, a white lustrous metal valued for its decorative beauty and electrical conductivity. Silver is located…

Gold (Au), chemical element, a dense lustrous yellow precious metal of Group 11 (Ib), Period 6, of the periodic table.…

Metallurgy, art and science of extracting metals from their ores and modifying the metals for use. Metallurgy…