Brass | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Brass


00:01:29 1 Properties
00:03:22 2 Lead content
00:05:20 3 Corrosion-resistant brass for harsh environments
00:06:12 4 Use in musical instruments
00:09:47 5 Germicidal and antimicrobial applications
00:10:38 6 Season cracking
00:11:35 7 Brass types
00:11:44 8 History
00:13:02 8.1 Early copper-zinc alloys
00:15:30 8.2 Brass making in the Roman world
00:18:58 8.3 Brass making in the medieval period
00:24:02 8.4 Brass in Africa
00:25:01 8.5 Brass making in Renaissance and post-medieval Europe
00:29:40 9 See also



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SUMMARY
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Brass is an alloy of copper and zinc, in proportions which can be varied to achieve varying mechanical and electrical properties. It is a substitutional alloy: atoms of the two constituents may replace each other within the same crystal structure.
It is simlilar to Bronze, another alloy containing copper, with tin included instead of zinc; both bronze and brass may include small proportions of a range of other elements including arsenic, lead, phosphorus, aluminum, manganese, and silicon. The distinction between the two alloys is largely historical, and modern practice in museums and archaeology increasingly avoids both terms for historical objects in favour of the more general "copper alloy".Brass 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 brass musical instruments such as horns and bells where a combination of high workability (historically with hand tools) and durability is desired. It is also used in zippers. Brass is often used in situations in which it is important that sparks not be struck, such as in fittings and tools used near flammable or explosive materials.