Zirconium is an element that is commonly used as an opacifier and refractory, though it is used in other applications as well. It was first discovered in the late 18th century, but was not isolated until the 19th century or made available in a pure from until the early 20th century. Zirconium is not found… Nyeem ntxiv »
Rhenium yog ib tug tsis tshua muaj hlau uas muaj ntau hom cim uas ua rau nws zoo tagnrho rau ntau lub hom phiaj hnub no. Nws muaj lub siab boiling taw tes ntawm tej lub ntsiab ntawm lub rooj rau lub sij hawm, Thiab nws muaj ib lub siab melting ntsiab lus. Vim li ntawd ntawm qhov no, rhenium is often used for… Nyeem ntxiv »
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