The noble gases (historically also the inert gases) make up a class of chemical elements with similar properties; under standard conditions, they are all odorless, colorless, monatomic gases with very low chemical reactivity.

A waste gas from the combustion of fuels in engines due to the reaction between nitrogen and oxygen.

NIMBY, an acronym for the phrase "not in my back yard" is a characterization of opposition by residents to proposed developments in their local area, as well as support for strict land use regulations.

An inventor, electrical engineer, mechanical engineer, and futurist best known for his contributions to the design of the modern alternating current (AC) electricity supply system.

A rechargeable battery having nickel oxide-hydroxide positive plates and iron negative plates, with an electrolyte of potassium hydroxide. It is often used in backup situations where it can be continuously charged and can last for more than 20 years

A type of rechargeable battery using nickel oxide hydroxide and metallic cadmium as electrodes

A nickel metal hydride battery is a type of rechargeable battery.

The newton-metre is a unit of torque (also called moment) in the SI system.

A concentrated solar energy plant utilising 760 parabolic troughs producing 134 GWh per year.

Neutron-induced swelling is the increase of volume and decrease of density of materials subjected to intense neutron radiation.

The neutron detection temperature, also called the neutron energy, indicates a free neutron's kinetic energy, usually given in electron volts.

A neutron source is any device that emits neutrons, irrespective of the mechanism used to produce the neutrons.

Protecting the inside of the vessel from fast neutrons escaping from the fuel assembly is a cylindrical shield wrapped around the fuel assembly.

In applications such as nuclear reactors, a neutron poison (also called a neutron absorber or a nuclear poison) is a substance with a large neutron absorption cross-section.

In nuclear engineering, a neutron moderator is a medium that reduces the speed of fast neutrons, ideally without capturing any, leaving them as thermal neutrons with only minimal (thermal) kinetic energy.

Neutron flux is a scalar quantity used in nuclear physics and nuclear reactor physics.

Neutron emission is a mode of radioactive decay in which one or more neutrons are ejected from a nucleus.

Neutron embrittlement, sometimes more broadly radiation embrittlement, is the embrittlement of various materials due to the action of neutrons.

Neutron capture is a nuclear reaction in which an atomic nucleus and one or more neutrons collide and merge to form a heavier nucleus.

Neutron activation is the process in which neutron radiation induces radioactivity in materials, and occurs when atomic nuclei capture free neutrons, becoming heavier and entering excited states.