| Letter: N | |
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| Nanocomposite | A mixture of materials (ceramic, metals, etc.) with dimensions on the nanometric scale (10-9 m). |
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| Nanomaterials/ Nanoparticles | Materials/solid particles with dimensions on the nanometric scale. |
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| Nanotechnology | Technology with the aim of developing applications based on nanomaterials. |
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| Newton | A unit of force in the International System (N), equal to the force required to produce acceleration of 1 m/s2 when exerted on a mass of 1 kg. |
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| Nitric oxides | Gases produced by the combustion of fossil fuels. They contribute to the formation of ozone in the lower atmosphere and "acid" depositions during normal rainfall. |
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| Non-hazardous waste | Categories of waste that are not dangerous to human health or the environment, classified on the basis of European Decision 2000/532/EC, modified by Decisions 2001/118/EC, 2001/119/EC and 2001/573/EC. |
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| NOx | See Nitric oxides. |
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