Neutron
An electrically neutral atomic particle that is stable when bound in an atomic nucleus. Neutrons are present in all known nuclei except the lightest isotope of hydrogen.
Nitrous Oxide
A colorless gas or liquid (N2O), soluble in water or alcohol. It is a product of the combustion of fossil fuel.
Northern Hemisphere
The half of the planet north of the equator.
Nuclear Fusion
A nuclear reaction in which two light nuclei combine, at extremely high temperatures, to form a heavier nuclei and simultaneously release a vast amount of energy.