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Un- UNC
- UNF tapping sizes, pitch and OD.
- Undamped Natural Frequency
- The same as the natural frequency of a structure.
- Undecagon
- An eleven sided polygon.
- Undercast
- An opaque cloud layer viewed from an observation point above the layer.
- Under-Cooling
- Cooling a material below the temperature of an equilibrium phase change fast enough to not allow the occurrence of the transformation.
- Understeer
- A handling condition in which the slip angle of the front tyres is greater than the slip angle of the rears.
- UNF
- UNF tapping sizes, pitch and OD.
- Unh
- The symbol for Unnilhexium. An element with an atomic number of 106.
- Unicode
- A standard of computer character set.
- Uniform Motion
- Motion at a constant velocity.
- Unijunction Transistor
- A trigger device that has an emitter lead (e) and two bases B1 and B2.
- Uninterruptible Power Supply
- A type of power supply designed to support the load for specified periods when the line varies outside specified limits.
- Unit
- A standard for comparison in measurements. For example, the metre is a standard length which may be compared to any object to describe its length.
- Unit Cell
- The smallest repetitive volume that comprises the complete pattern of a crystal.
- Unit Circle
- A circle with radius 1.
- Unit Cube
- A cube with edge length 1.
- Unit Fraction
- A fraction whose numerator is 1.
- Unit of Blood
- Unit of volume for human blood and its components.
- Unit Square
- A square of side length 1.
- Unit Vector
- A vector with a length of 1.
- Unity
- One.
- Universal Indicator
- A universal indicator is an indicator which undergoes several colour changes over a wide range of pH.
- Universal Law of Gravitation
- Every particle in the Universe attracts every other with a force which is proportional to the product of their masses and inversely proportional to the square of their seperation.
- Universal Milling Machine
- A milling machine with a worktable that can be swiveled for milling helical work.
- Universal Serial Bus
- An external bus standard that supports data transfer rates of 12 Mbps.
- Universe
- All the matter and space that exists.
- Unnilhexium
- Element with an atomic number of 106.
- Unnilpentium
- Element with an atomic number of 105.
- Unnilquadium
- An element with an atomic number of 104.
- Unnilseptium
- An element with an atomic number of 107.
- Unp
- The symbol for Unnilpentium. An element with an atomic number of 105.
- Unq
- The symbol for Unnilquadium. An element with an atomic number of 104.
- Uns
- The symbol for Unnilseptium. An element with an atomic number of 107.
- Unsaturated Compounds
- Organic compounds containing double or triple bonds capable of forming addition products.
- Unsaturated Solution
- A solution with a concentration lower than its equilibrium solubility.
- Unsigned Binary Number
- A binary number in which all the bits are used to represent positive quantities.
- Unstable Equilibrium
- A body is in unstable equilibrium if it does not return to its equilibrium position and does not remain in the displaced position after it has been displaced slightly.
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