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 Glossary
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| EDITORS: |
 InglesiAditya Vardhan Eni Generalic |
 FrancesiMichel Ditria |
 CroatoEni Generalic Marija Bralic Slobodan Brinic |
 TedescoMarc Hens |
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U |
Ultraviolet-visible region | Unified atomic mass unit | Universe of data |
- Ultraviolet-visible region
- Ultraviolet/visible region is the region of the electromagnetic spectrum between 180 and 780 nm; associated with electronic transitions in atoms and molecules.
- Unified atomic mass unit
- Unified atomic mass unit (u) is a unit of mass used in atomic, molecular, and nuclear science, defined as the mass of one atom of 12C divided by 12. Its approximate value is
u = (1.660 565 
0.000 008 6) × 10-27 kg
- Universe of data
- Universe of data is synonymous with a population of data.
