wear-resistant material
81Chromium nitride — IUPAC name Chromium nitride …
82Overhead lines — This article is about the transmission of electrical power to road and rail vehicles. For transmission of bulk electrical power to general consumers, see Electric power transmission. For powerlines mounted on pylons, see overhead power line.… …
83boron carbide — Chem. a black, crystalline, extremely hard, water insoluble solid, B4C, used chiefly as a moderator in nuclear reactors, as an abrasive, and as a refractory. * * * ▪ chemical compound (B4C), crystalline compound of boron and carbon. It is… …
84Hawker Hurricane — Hurricane Hurricane Mk I (R4118), which fought in the Battle of Britain Role Fighter …
85Ten-pin bowling — is a competitive sport in which a player (the “bowler”) rolls a bowling ball down a wooden or synthetic (polyurethane) lane with the objective of scoring points by knocking down as many pins as possible. The convert|41.5|in|cm|0|lk=on|sing=on… …
86Bell Rocket Belt — The Bell Rocket Belt is a low power rocket propulsion device that allows an individual to safely travel or leap over small distances. It is a type of rocket pack.OverviewIn the early 1960s, Bell Aerosystems built a rocket pack which it called the …
87manganese — /mang geuh nees , neez /, n. Chem. a hard, brittle, grayish white, metallic element, an oxide of which, MnO2 (manganese dioxide), is a valuable oxidizing agent: used chiefly as an alloying agent in steel to give it toughness. Symbol: Mn; at. wt …
88Ruthenium — (pronEng|ruːˈθiːniəm) is a chemical element that has the symbol Ru and atomic number 44. A rare transition metal of the platinum group of the periodic table, ruthenium is found associated with platinum ores and used as a catalyst in some platinum …
89Racing shell — Toronto rowers in a 4+ oar shell In watercraft, a racing shell (also referred to as just a fine boat (UK) or just shell) is an extremely narrow, and often disproportionately long, rowing boat specifically designed for racing or exercise. It is… …
90Venus in fiction — In science fiction stories of the 1920s 1960s, the planet Venus was frequently described as a tropical planet, hot and misty, covered with jungle, swamps, and oceans. In 1918, chemist Svante Arrhenius, deciding that Venus cloud cover was… …
