CHEMISTRY GLOSSARY

Euler number    →   Eulerova značajka

Euler number (Eu) is a dimensionless quantity used in fluid mechanics, defined by

where p is pressure, ρ is density, and v is velocity.

nitride    →   nitrid

Nitrides are compounds of nitrogen with metal in which nitrogen has an oxidation number -3, are hard and resistant to high temperatures.

nitrite    →   nitrit

Nitrite are hard ionic compounds that contain anion (NO₂^-) and cation of metal. They are usually reducing agents.

nitro colour    →   nitrobojilo

Nitro colours are artificial organic colours that contain nitro-group. They are used for colouring skin, wool and silk.

nitroso compound    →   nitrozo spoj

Nitroso compounds are compounds that contain the nitroso-group (.NO).

nitrosoamine    →   nitrozoamin

Nitrosoamines are carcinogenic compounds that contain nitroso and amino-group in a single molecule.

nomenclature    →   nomenklatura

Nomenclature is a system of naming elements, ions and compounds.

nominal    →   nominalno

Nominal is used to describe a process where 100 % accuracy is not guaranteed. For example, sand filtres are usually sold to filtre to a nominal 10 μm, which means that they will filtre most particles of 10 μm and larger, but not all. A filtre which is guaranteed to filtre all particles of 10 μm would be termed absolute rather than nominal.

non-Newtonian fluid    →   nenewtonski fluid

Non-Newtonian fluid is a fluid whose viscosity changes when the gradient in flow speed changes. Colloidal suspensions and polymer solutions like ketchup and starch/water paste are non-Newtonian fluids.

nonelectrolyte    →   neelektrolit

Nonelectrolytes are substances which in solutions do not dissociate into ions and they do not conduct electric current.