Luminescence

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Luminescence, loo muh NEHS uhns, is the giving off of light by means other than heat. The emission of light by means of heat is known as incandescence. Luminescence usually involves visible light. But luminescence can also refer to infrared and other forms of light the eye cannot see.

Ultraviolet rays

Ultraviolet rays are an invisible form of light. They lie just beyond the violet end of the visible spectrum. The sun is the major natural source… See more »

Angstrom

Angstrom, ANG struhm, is a unit of length used to measure very small distances. For example, the atoms in a salt crystal are only several angstroms… See more »

Phosphorescence

Phosphorescence, fos fuh REHS uhns, is the light certain substances give off when they absorb energy. The general term for the emission of light… See more »

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Luminescence

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