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| Ultra vires
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Action that is beyond what is legally allowed. |
| Ultracoil
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True double wall heat exchanger. |
| Ultrasonic
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Vibrations above the range of normal human hearing (50kHz or higher). |
| Ultrasonic examination
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An inspection method using ultrasonic waves to locate structural flaws in a sample of material. |
| Ultrasonic stud finder
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A device using ultrasonic waves to detect studs behind a wall. |
| Ultraviolet
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Electromagnetic radiation in the wavelength range of 4 to 400 nanometers. |
| Ultraviolet degradation
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A reduction in certain performance limits caused by exposure to ultraviolet light. |
| Ultraviolet light (uv)
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A form of luminous energy occupying a position in the spectrum of sunlight beyond the violet, and having wavelengths that do not enter the visible spectrum. UV rays accelerate deterioration of roof materials. Hence, the need for protective coatings. |
| Umbel
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A part of the plant bearing flowers in which all the flower stalks are of similar length and arise from the same point. |
| Unconditioned space
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A space that is neither directly nor indirectly conditioned space, which can be isolated from conditioned space by partitions and/or closeable doors. |
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