Natural caoutchouc is an addition polymer of isoprene. It is obtained from tropical plant of rubber-tree by coagulation of rubber-tree-milk.
Natural gas is a naturally occurring mixture of gaseous hydrocarbons. The approximate composition of natural gas is 85 % methane, 10 % ethane, 3 % propane, with lesser amounts of butane, and other higher alkanes. Natural gas is used as a fuel and for the manufacture of chemicals.
Natural resins are organic compounds which are secreted by some plants and insects. They are used as adhesives, and are very often unsoluble in water.
Nautical mile is a legal international unit of length temporarily maintained with the SI. It is still used in navigation (merchant marine, aviation). It is equal to the length of an arc of one minute measured at a latitude of N 45° (mile = 1852 m). The international nautical mile has been taken equal to the nautical mile.
Navier-Stokes equations are a set of complex equations for the motion of a viscous fluid subject to external forces.
Negative pole is that half-cell in electrochemical cell that has the most negative electrode potential.
Neon was discovered by Sir William Ramsay and Morris W. Travers (England) in 1898. The origin of the name comes from the Greek word neon meaning new. It is colourless, odourless inert gas. Non-reactive even with fluorine. Fourth most abundant element in the universe. Neon is obtained by liquefaction of air and separated from the other gases by fractional distillation. Primarily for lighting.
Neptunium was discovered by Edwin M. McMillan and P. H. Abelson (USA) in 1940. Named after the planet Neptune. It is rare, silvery radioactive metal. Resists alkalis; reacts with oxygen and acids. Attacked by steam. Radiotoxic. Neptunium was produced by bombarding uranium with slow neutrons.
Generalic, Eni. "PloÅ¡no centrirana kubiÄna reÅ¡etka." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
Glossary
Periodic Table