Ni

Ni
Nickel is a metallic element that is malleable and ductile, and is resistant to corrosion in air or water, and hence is used as a protective coating.
Niacin
Vitamin B3 is a crystalline acid found in meat and yeast and produced by the oxidation of nicotine.
Nibble
A group of four bits or half a byte (8-bits).
NIC
Abbreviation of Network Interface Card.
Nicad
Abbreviation of Nickel Cadmium Battery.
Nichrome
An alloy of nickel and chromium used for heating elements.

Nickel
A metallic element that is malleable and ductile, and is resistant to corrosion in air or water, and hence is used as a protective coating.
Nickel Brass
A copper alloy containing zinc and a small quantity of nickel.

Nickel Cadmium Battery
The battery has a nickel-hydroxide cathode, a cadmium anode, and aqueous potassium hydroxide electrolyte.
Nickel Iron Battery
Cathodes of nickel-oxide and anodes of iron in a potassium hydroxide solution.
Nickel Metal Hydride Battery
The battery has a nickel-hydroxide cathode, a metal hydride anode, and aqueous potassium hydroxide electrolyte.
Nickel Plating
A technique of electroplating a thin layer of nickel onto a metal object.
Nickel Silver
Copper nickel zinc alloy.

Nickel Zinc Battery
Nickel oxide cathode and a zinc anode in a small amount of potassium hydroxide electrolyte.
Nicotine

CH14N2

Colourless, very poisonous oily liquid.

Nicotinic Acid
Vitamin B3 is a crystalline acid found in meat and yeast and produced by the oxidation of nicotine.
Nimbostratus
This cloud exhibits a combination of rain or snow, and sometimes the base of the cloud cannot be seen because of the heaviness of precipitation.
NIMEP
The ratio of net work per cycle to cylinder volume displaced per cycle.
NiMH
A common abbreviation for Nickel Metal Hydride Battery.
Nimonic
An alloy consisting of roughly 80% nickel and 20% chromium with additives such as titanium and aluminium.
Nimonic 75
A Nickel-Chromium alloy with good corrosion and heat resistance. Often used for aircraft fasteners.

Nimonic 90
An alloy consisting of roughly 80% nickel and 20% chromium with additives such as titanium and aluminium. The main use is in gas turbine blades. Nimonic is a registered trademark of Special Metals Corporation and is a family of metals.

Nine Point Centre
In a triangle, the circumcenter of the medial triangle is called the nine point centre.
Nine Point Circle
In a triangle, the circle that passes through the midpoints of the sides is called the nine point circle.
Niningerite
Rare naturally occuring mineral of Magnesium Sulphide.
Niobium
As a pure metallic element it is very reactive and forms an extremely stable oxide when exposed to air which enhances its corrosion resistance.
NIOSH
Abbreviation of National Institute for Occupational Safety and Health.
NIST
Abbreviation of National Institute for Standards and Technology.
nit
Unit of luminance, equal to one candela per square meter, or 10-4 stilb.
Nitrate
The NO3- ion, formed by reaction of nitric acid with a base or a compound containing the NO3- ion.
Nitrating
A case hardening process in which ammonia or some other form of nitrogen is introduced to the surface of certain alloys.
Nitre
Old fashioned name for Potassium Nitrate.
Nitric Acid

HNO3

Colourless, corrosive, acid liquid that attacks most metals and other substances releasing nitrogen dioxide.

Nitric Oxide
A colourless gas that forms nitrogen dioxide in contact with air.
Nitriding
Introducing nitrogen into the surface layer of a solid ferrous alloy. This is done to increase hardness, wear resistance and fatigue strength.
Nitrile
An organic compound which has a -C=N functional group.
Nitrite
The NO2- ion, formed by reaction of nitrous acid with a base or a compound containing the NO2- ion.
Nitrobenzene
A yellow liquid obtained from the action of concentrated nitric and sulphuric acid on benzene.
Nitrocarburizing
Several processes in which both nitrogen and carbon are absorbed into the surface layers of a ferrous material and, by diffusion, create a concentration gradient.
Nitrogen
A gaseous colourless and odourless element that makes up about 80% of the atmosphere.
Nitrogen Cycle
The exchange of nitrogen between animals and plants, in which plants convert urea or nitrates to protein, animals digest protein and excrete its nitrogen content an urea, which is taken up again by plants.
Nitrogen Dioxide

NO2

An intermediate in the industrial synthesis of nitric acid, millions of tons of which are produced each year. This reddish-brown toxic gas has a characteristic sharp, biting odor and is a prominent air pollutant.

Nitrogen Fixation
Conversion of atmospheric nitrogen (N2) into a reduced, biologically available form.
Nitrogen Monoxide

NO

A free radical and is an important intermediate in the chemical industry.

Nitrogen Oxides
Several air-polluting gases composed of nitrogen and oxygen which play an important role in the formation of photochemical smog.
Nitrogenase Complex
A system of enzymes capable of anaerobic reduction of atmospheric nitrogen to ammonia in the presence of ATP.
Nitroglycerine

C3H5N3O9

A heavy, yellow or colourless, oily, explosive liquid obtained by nitrating glycerol.

Nitromagnesite
Naturally occuring Magnesium Nitrate.
Nitrous Oxide
Also known as laughing gas, an anaesthetic.