Cutlery, cutting implements, such as knives, razors, and scissors, used for industrial, commercial, and domestic purposes. History Prehistoric…

Bran, the edible broken seed coat, or protective outer layer, of wheat, rye, or other cereal grain, separated from the kernel.…

a substance to that of a standard substance. hydrometerHydrometer used to measure the specific gravity…

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.…