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View history; General ... price of a compound is used, per mass of element contained. This implicitly puts the value of compounds' other constituents, and the cost of ...
Nations in red currently use the dirham. Nations in green use a currency with a subdivision named dirham. Silver dirham of Caliph Umar ibn Abd al-Aziz 718–719 CE Silver dirham of Yazid II minted in 721–722 CE Silver dirham of Marwan II ibn Muhammad 749–745 CE Silver dirham of As-Saffah 754–758 CE Silver dirham of Al-Hadi minted in 786–787 CE in al-Haruniya Silver dirham of Al-Mu ...
Islamic Golden Age brass astrolabe Brass lectern with an eagle. Attributed to Aert van Tricht, Limburg (Netherlands), c. 1500.. Brass is an alloy of copper and zinc, in proportions which can be varied to achieve different colours and mechanical, electrical, acoustic and chemical properties, [1] but copper typically has the larger proportion, generally 66% copper and 34% zinc.
Tombac, or tombak, is a brass alloy with high copper content and 5–20% zinc content. [1] Tin, lead or arsenic may be added for colouration. [2] [3] It is a cheap malleable alloy mainly used for medals, ornament, decoration and some munitions. In older use, the term may apply to brass alloy with a zinc content as high as 28–35%. [1] [4]
Akan goldweights (locally known as mrammou or abrammuo) [1] are weights made of brass used as a measuring system by the Akan people of West Africa, particularly for wei and fair-trade arrangements with one another. The status of a man increased significantly if he owned a complete set of weights.
The Saruq Al Hadid site is considered to have been a centre of constant human habitation, trade and metallurgy from the Umm Al Nar period (2600–2000 BCE) to the Iron Age (1,000 BCE), when it was a major location for smelting bronze, copper and Iron. [2]
Orichalcum or aurichalcum / ˌ ɔːr ɪ ˈ k æ l k ə m / is a metal mentioned in several ancient writings, including the story of Atlantis in the Critias of Plato.Within the dialogue, Critias (460–403 BC) says that orichalcum had been considered second only to gold in value and had been found and mined in many parts of Atlantis in ancient times, but that by Critias's own time, orichalcum ...
Consequently, at the temperatures needed to reduce zinc oxide to the metal, the metal is already gaseous. [23] [24] Arsenic sublimes at 615 °C (1137 °F), passing directly from the solid state to the gaseous state. [21] Antimony melts at 631 °C (1167 °F) [21] Platinum melts at 1768 °C (3215 °F), even higher than iron. [21]