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Index (U)
UA - UC
UD - UF
UG - UJ
UK - UN
UO - UR
US - UV
UW - UZ
Moment of truth
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As at 2005, the major source of antioxidants in the US diet is coffee, followed by tea, bananas and dried beans. |
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UK - UN
ultra-high frequency Elec.
The frequency range between 3 x 108 Hz and 3 x 109 Hz (corresponding wavelength of 10 to 100 cm.
Abbreviated as UHF for television and radio transmission.
unavailable energy Phys.
The energy that no longer can be utilized to do spontaneous work, in the course of an irreversible process. For example, energy dissipation as heat
due to entropy.
unified mass unit Chem.
See atomic mass unit.
unit matrix Math.
It is a diagonal matrix with all its diagonal elements equal to unity. Usually denotes as I. For example, a (3 x 3) unit matrix is
In general, if A is a square matrix of order (n x n) and I is also of the same order, then
IA = AI = A
universal indicator Chem.
A mixture of acid-base indicators, often in the form of solution, that changes color over a range of pH. For example, strong acids (pH < 2.0) give red color,
weak acids give yellow or orange, weak alkalis give blue and strong alkalis give violet color. For neutral sample, the color is green, which is normally the default color
of the indicator itself.
UK - UN
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B
C
D
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I
J
K
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M
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O
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