The body of a propeller-type wind turbine, containing the gearbox, generator, blade hub, and other parts.

Nanocrystal solar cells are solar cells based on a substrate with a coating of nanocrystals.

The nanometre is a unit of length in the metric system, equal to one billionth (short scale) of a metre (0.000000001 m).

Nanotechnology, also shortened to nanotech, is the use of matter on an atomic, molecular, and supramolecular scale for industrial purposes.

Either the government of the country in which the ship is registered, or the Administration delegated to deal with merchant shipping for that country.

The National Ignition Facility (NIF), is a large laser-based inertial confinement fusion (ICF) research device, located at the Lawrence Livermore National Laboratory in Livermore, California.

The National Institute for Occupational Safety and Health (NIOSH) is the United States federal agency responsible for conducting research and making recommendations for the prevention of work-related injury and illness.

Natural climate forcings include changes in the Sun's brightness and volcanic eruptions that inject light-reflecting particles as high as the stratosphere.

Natural convection is a type of flow, of motion of a liquid such as water or a gas such as air, in which the fluid motion is not generated by any external source (like a pump, fan, suction device, etc.) but by some parts of the fluid being heavier than other parts.

A cooling tower design that uses natural convection currents of hot air to draw air into the tower to cool the water.

Natural gas (also called fossil gas; sometimes just gas) is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium.

Gas without condensation at common operating pressures and temperatures where the predominant component is methane with some ethane and small amounts of heavier hydrocarbons.

With new emission control regulations taking effect, gas as a ship fuel, once banned, is now re-emerging as an environmentally and economically attractive option.

Natural-gas processing is a range of industrial processes designed to purify raw natural gas by removing impurities, contaminants and higher molecular mass hydrocarbons to produce what is known as pipeline quality dry natural gas.

Natural gas is a commodity that can be stored for an indefinite period of time in natural gas storage facilities for later consumption.

A natural gas vehicle (NGV) is also an alternative fuel vehicle that uses compressed natural gas (CNG) or liquefied natural gas (LNG).

Financed by the Norwegian Directorate of Public Roads, a car ferry GLUTRA with a capacity of 100 private cars was designed for operation on natural gas, based on a new set of Norwegian safety standards for gas fuelled passenger ships.

The PaxCar ferry VIKING GRACE is the largest LNG fuelled passenger ship. Built in STX Turku yard, the ship is designed for efficient year-round service on the trans-Baltic route linking the southwest Finnish port of Turku with Stockholm.

A monopoly in an industry in which high infrastructural costs and other barriers to entry relative to the size of the market give the largest supplier in an industry, often the first supplier in a market, an overwhelming advantage over potential competitors.

A fossil natural nuclear fission reactor is a uranium deposit where self-sustaining nuclear chain reactions have occurred.