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Bookmark or Share- Hafnium | Encyclopedia.comHafnium has been used as an alloying agent for iron, titanium, niobium, and other metals. Finely divided hafnium is pyrophoric and can ignite spontaneously in air. Melting near 3,890 ° C, (7,034 ° F), hafnium carbide (HfC) has the highest melting point of any known binary compound.
- Titanium - Encyclopedia.comTitanium is known as a transition metal on the periodic table of elements denoted by the symbol Ti. It is a lightweight, silver-gray material with an atomic number of 22 and an atomic weight of 47.90. It has a density of 4510 kg/m 3, which is somewhere between the densities of aluminum and stainless steel.
- Friedrich Wohler - Encyclopedia.comHe is also known for his important studies of the elements boron, silicon, beryllium, and titanium. W ö hler's synthesis of urea was the result of experiments begun in 1823, in which he investigated the salts of cyanic acid, known as cyanates. In 1824 W ö hler showed that the empirical formula of silver cyanate was AgNCO. Justus von Liebig ...
- Tithes - Encyclopedia.comIn Europe a system of tithes came into legal force in the early Middle Ages (e.g. in England in 900), as a tax for the support of the Church and relief of the poor. The levy consisted of a tenth part, originally of the produce of lands (‘praedial’ tithes) and later of the profits of labour also (‘personal’ tithes).
- Zirconium Oxide - Encyclopedia.comZirconium, symbol Zr on the Periodic Table, is a metal most often found in and extracted from the silicate mineral zirconium silicate and the oxide mineral baddeleyite. In its various compound forms, the grayish-white zirconium is the nineteenth most plentiful element in the earth's crust, where it is far more abundant than copper and lead.
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