Things like what is metal?, or what is the most valuable metal? Some of the oldest known metals are gold,silver, copper, iron, tin and lead and they are still the most useful and widely used metals.Metals are solid not transparent, they have luster and are heavy. I guess you could include mercury as a metal yet it is a liquid. Another is solium, which is solid but very light in weight.
And I found that the most valuable metal is not the one most people think, most people would say gold but they would be wrong, by the cost per once yes, but you would be wrong if you looked at the use of each. Iron has the most uses for it. Three forms which differ very much in their properties. Their is Cast-Iron easily fusible and quite brittle. I remember dropping one of my grandmothers lids off the coal stove that she used to cook with and we had to buy a new one because it being a form of cast iron it could not be forged or welded. The next comes wrought-iron, fusible only at high temperatures, but can be hammered out flat, welded and drawn out in a form of wire. A friend of mine used to run a wire rope plant in Pennslyvania and I was just amazed at what they could do with this metal, making it look almost like cloth rope, but many times the strength that was used for things like to hold up bridges and towers.
The next is steel, the most wonder thing we produce with iron, it is malleable and can be welded. The great property of steel, it acquires when tempered a very hard degree of hardness.A simple explanation is that the most noticeable feature is in the chemical composition of the different grades of iron is found in the percentages of carbon it contains thus pig-iron contains the most carbon, steel the next lowest and wrought-iron the least.
Iron has been around to man from early historical times. Savage tribs in many parts of the world practiced the art of smelting.
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