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Index (T)
TA - TC
TD - TF
TG - TJ
TK - TN
TO - TR
TS - TV
TW - TZ
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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Torino hazard scale Space
Measure the risk of asteroid impacts on Earth. Adopted in June 1999, it is named after the city in Italy. Classification of asteroid threats are based on many complicated factors, including
the asteroid's path and projection of future path that might change as a result of gravity effects from other nearby bodies. A zero rating (white) indicates the asteroid poses no possible threat
to Earth, while red zone (8 to 10 ratings) indicate certain collisions.
torr Met.
A non-SI unit of pressure. It is equal to the atmospheric pressure that supports a column of mercury barometer of 1 millimeter high. Hence, 1 torr = 1mmHg. The unit is named after
Evangelista Torricelli (1608-1647), an Italian physicist and mathematician. Since by standard definition, a standard atmospheric pressure is equal to 101325 N/m2 (or Pa) and raise
the mercury column to 760 mmHg. Therefor 1 torr = 101325/760 = 133.3223684 Pa.
transgenic Biol.
Introduction of foreign gene into genome in order to alter the biological or physical characteristics of an organism. Transgenic can be carried out by stem cell transformation by growing in tissue culture
with the desire DNA or direct injecting of the foreign gene into the pronucleus of an egg.
transposed matrix Math.
A matrix with the rows and columns of the elements interchanged. For example, if A is a (3 x 2) matrix given by
Its corresponding transposed matrix is defined as
That is, the (3 x 2) matrix is transposed to become a (2 x 3) matrix.
transuranic elements Chem.
Elements appear after uranium in the Periodic Table of the Elements with the atomic number greater than 92. These elements are only
synthesized in nuclear reactor except neptunium and plutonium which are found in small quantities in nature.
tribology Phys., Eng.
The study of two surface contacts and in relative motion such as friction, lubrication and wear.
triple point Phys., Chem.
The temperature and pressure at which the vapour, liquid and solid phases of a substance are in equilibrium. For water, this occurs at 273.16 K and 611.2 Pa of pressure.
This temperature forms the basis of the definition of the kelvin and the thermodynamic temperature scale.
tritium Chem.
An isotope of the element hydrogen. It has a symbol T of 1H3 with mass number 3, which consists of one proton and
two neutrons at the atomic nucleus. Tritium is radioactive and has a half-life of 12.3 years, undergoing beta decay to helium-3. It is
used as a tracer or labeling in chemical and biochemical research. It is also used in making hydrogen bombs which involve nuclear fusion reaction
with deuterium.
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