n

• amount of substance expressed in moles;

• born [Lat. natus];

• haploid chromosome number;

• index of refraction;

• nerve;

• neuter;

• neutron;

• neutron night;

• number density;

• normal;

• nostril [Lat. naris];

• number;

• number of density of molecule;

• principal quantum number;

• refractive index;

• rotational frequency;

• sample size