Search Results for: Jewellery of metal clad with precious metal parts
smelted from sulfide ores, c. bc, the first metal to be cast into a shape in a mold, c. bc and the first metal to be purposefully alloyed with another metal, tin , to create bronze , c. bc. [ ] in the roman era , copper was principally mined on cyprus , the origin of the name of the metal, from aes сyprium
on thermal vibrations of the lattice, which are relatively weak in a soft metal. [ ] the maximum permissible current density of copper in open air is approximately × a/m of cross-sectional area, above which it begins to heat excessively. [ ] copper is one of a few metallic elements with a natural color...
https://en.wikipedia.org/wiki/Copper