Glossary B
Español: Bolsa / Français: Sac / Italiano: Borsa
A bag (also known regionally as a sack) is a common tool in the form of a non-rigid container. The use of bags predates recorded history, with the earliest bags being no more than lengths of animal skin or woven plant fibers, folded up at the edges and secured in that shape with strings of the same material. Despite their simplicity, bags have been fundamental for the development of human civilization, as they allow people to easily collect loose materials such as berries or food grains, and to transport more items than could readily by carried in the hands.
Deutsch: Sprödigkeit / Español: Fragilidad / Français: Fragilité / Italiano: Fragilità
A material is brittle if, when subjected to stress, it breaks without significant deformation (strain). Brittle materials absorb relatively little energy prior to fracture, even those of high strength. Breaking is often accompanied by a snapping sound. Brittle materials include most ceramics and glasses (which do not deform plastically) and some polymers, such as PMMA and polystyrene. Many steels become brittle at low temperatures (see ductile-brittle transition temperature), depending on their composition and processing.
Deutsch: Bürste / Español: Brocha (instrumento) / Português: Escova
A brush is a tool with bristles, wire or other filaments, used for cleaning, grooming hair, make up, painting, surface finishing and for many other purposes. It is one of the most basic and versatile tools known to mankind, and the average household may contain several dozen varieties. It generally consists of a handle or block to which filaments are affixed either parallel- or perpendicular-wise, depending on the way the brush is to be gripped during use. The material of both the block and bristles or filaments is chosen to withstand hazards of its application, such as corrosive chemicals, heat or abrasion.
In the industrial and industry context, a "bolt" is a type of fastener that consists of a cylindrical body, typically made of metal, with a threaded shaft. Bolts are used to join two or more objects together by screwing the bolt into a pre-drilled or threaded hole in one of the objects, and then using a nut to tighten the connection.