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Metal manufacturing processes usually begin in a casting foundry.
Ceramics are compounds between metallic and non-metallic elements.
Ceramics are usually not good conductors of electricity or heat.
Polymers are mostly soft and not as strong as metals or ceramics. Low density and viscous behavior under elevated temperatures are typical polymer traits. A metal is most likely a pure metallic element, (like iron), or an alloy, which is a combination of two or more metallic elements, (like copper-nickel), the atoms of a metal, similar to the atoms of a ceramic or polymer, are held together by electrical forces.
Manufacturing processes are applicable in all areas of our lives, so much that we often don't realize or think about it.
The simplest explanation for these types of bonding forces would be positively charged ion cores of the element, (nucleus's of the atoms and all electrons not in the valence level), held together by a surrounding "sea" of electrons, (valence electrons from the atoms).The opposite charge causes them to bond together electrically. Covalent bonding means the electrons are shared by both atoms, in this case electrical forces between the two atoms still result from the difference in charge, holding them together.To simplify think of a building framework structure.The manufacturer must consider the properties of these materials with respect to the desired properties of the manufactured goods.Simultaneously, one must also consider manufacturing process.
When the surface of a metal is polished it has a lustrous appearance; although this surface luster is usually obscured by the presence of dirt, grease and salt. Also, metals are extremely good conductors of electricity and heat.