Cutlery
Cutlery, cutting implements, such as knives, razors, and scissors, used for industrial, commercial, and domestic…
Specific gravity
a substance to that of a standard substance. hydrometerHydrometer used to measure…
Grinding
Sandpapers Sandpapers (coated abrasive) are the next most significant abrasive product. They…
Emission spectroscopy
Spectroscopy also provides a precise analytical method for finding the constituents in material having unknown chemical composition.…
Stone Age
Stone Age, prehistoric cultural stage, or level of human development characterized by the creation and use…
Gold
Gold (Au), chemical element, a dense lustrous yellow precious metal of Group 11 (Ib), Period 6,…
Metallurgy
Metallurgy, art and science of extracting metals from their ores and modifying the metals…
Mineral deposit
Mineral deposit, aggregate of a mineral in an unusually high concentration. About half of the known chemical…




