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What is lanthanum atomic mass?
Im not sure about the atomic mass bit but Lanthanum is a silvery white, malleable, ductile, and soft rare-earth metal xx
How long is one ounce of gold made into wire into kilometres?
It depends on how thick the gold wire is. Gold is extremely ductile.
How many feet in a troy ounce of silver wire?
It depends on how thin the wire is. Silver is very ductile. According to one source(*), an ounce of silver can be drawn out into a wire 60 miles long (316,800 feet) - such a wire would make a human hair look very thick by comparison. As a point of comparison, the same source notes that an ounce of gold, the most ductile of metals, can be drawn out into a wire 1300 miles (6,864,000 feet) long! (*) Hassell, Joseph, "Common Things and Elementary Science in the Form of Object Lessons", Blackie & Son, London, 1884. page 326 http://books.google.com/books?id=3qEIAAAAQAAJ&printsec=titlepage&source=gbs_v2_summary_r&cad=0
What does it mean if a material has a high Yield Stress value?
In colloquial terms, it is "strong". It can take a high load, and return back to an undamaged, undeformed state afterward. If the yield strength is equal to or very close to the ultimate tensile strength, common when it is a very high value, that indicates the material is not very ductile. Glass is a material like this. You can load it very high, but it will break rather than "stretch".
