By comparison, bronze is principally an alloy of copper and tin. Bronze does not necessarily contain tin, and a variety of alloys of copper, including alloys with arsenic, phosphorus, aluminium, manganese, and silicon, are commonly termed "bronze". The term is applied to a variety of brasses and the distinction is largely historical, both terms having a common antecedent in the term latten.
Brass is a substitutional alloy. It is used for decoration for its bright gold-like appearance; for applications where low friction is required such as locks, gears, bearings, doorknobs, ammunition casings and valves; for plumbing and electrical applications; and extensively in musical instruments such as horns and bells for its acoustic properties. It is also used in zippers. Brass is often used in situations where it is important that sparks not be struck, as in fittings and tools around explosive gases.
Fes or Fez (Arabic: فاس Moroccan Arabic: [fɛs], Berber: Fas, ⴼⴰⵙ) is the third largest city of Morocco, with a population of approximately 1 million (2010). It is the capital of the Fès-Boulemane region.
Fas el Bali is a UNESCO World Heritage Site. Its medina, the larger of the two medinas of Fes, is believed to be the world's largest contiguous car-free urban area. Al-Qarawiyyin, founded in AD 859, is the oldest continuously functioning madrasa in the world. The city has been called the "Mecca of the West" and the "Athens of Africa".