Deutsch: Geräusch / Español: Ruido / Português: RuaDdo / Français: Bruit -/ Italiano: Rumore
Noise means any unwanted sound. Noise is not necessarily random. Sounds, particularly loud ones, that disturb people or make it difficult to hear wanted sounds, are noise. For example, conversations of other people may be called noise by people not involved in any of them; any unwanted sound such as domesticated dogs barking, neighbours playing loud music, portable mechanical saws, road traffic sounds, or a distant aircraft in quiet countryside, is called noise.
Deutsch: Gummi / Español: Hule / Português: Borracha / Français: Caoutchouc (matériau) / Italiano: Gomma
Natural rubber, also called India rubber or caoutchouc, as initially produced, consists of suitable polymers of the organic compound isoprene, with minor impurities of other organic compounds plus water. Forms of polyisoprene that are useful as natural rubbers are classified as elastomers.