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U
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- uncertainty principle
- The idea that a theoretical limit exists on the accuracy with which the product of the position and momentum of a particle can be determined.
- unimolecular process
- An elementary step in a reaction mechanism; formally no species collide in such a step, but in actuality such processes usually involve a collision with a species that does not react.
- unit cell
- The smallest fragment of the structure of a solid that by repetition can generate the entire structure.
- unsaturated
- Describing 1) a solution that contains less than the maximum possible equilibrium concentration of a solute, or 2) an organic compound containing double or triple bonds.
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