For other uses, see N (disambiguation).
In general, n or N is a common symbol to use in mathematical equations to stand for a count or value.
In physics, n may refer to the recommended symbol for:
- refractive index, in optics
- principal quantum number (atomic and nuclear physics)
- order of reflection (physics)
- electron density (solid state physics)
- amount of substance (chemical physics)
In physics, N may refer to the recommended symbol for:
- number of molecules (molecular physics)
- turning number (electricity and magnetism)
- neutron number (atomic and nuclear physics)
- total angular quantum momentum number (molecular spectroscopy).
- N, in Brillouin zone, the center of a face of a body-centered cubic lattice
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