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tritium, T (s) (noun), tritiums (pl)
1. A radioactive hydrogen isotope with an atomic mass three times that of the common protium isotope: Tritium has two neutrons as well as a proton in the nucleus which occurs in very small traces in nature; however, it can be made artificially from lithium or deuterium in nuclear reactors and it is used as the explosive in thermonuclear bombs.
2. Etymology: from Greek tritos, "third".
This entry is located in the following unit: trito-, trit- (page 1)
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tesla, T; magnetic induction
The SI unit of magnetic flux density (field intensity) for magnetic fields.

The intensity of a magnetic field can be measured by placing a current-carrying conductor in the field. The magnetic field exerts a force on the conductor, a force which depends on the amount of the current and on the length of the conductor.

One tesla is defined as the field intensity generating one newton of force per ampere of current per meter of conductor.

One tesla represents a magnetic flux density of one weber per square meter of area. A field of one tesla is quite strong: the strongest fields available in laboratories are about 20 teslas, and the earth's magnetic flux density, at its surface, is about 50 microteslas (┬ÁT); and one tesla equals 10,000 gauss.

Magnetic fields are measured in units of tesla (T). The tesla is a large unit for geophysical observations, and a smaller unit, the nanotesla (nT; one nanotesla equals 10−9 tesla), is normally used.

A nanotesla is equivalent to one gamma, a unit originally defined as 10−5 gauss, which is the unit of magnetic field in the centimeter-gram-second system. Both the gauss and the gamma are still frequently used in the literature on geomagnetism even though they are no longer standard units.

The tesla, defined in 1958, honors the Serbian-American electrical engineer Nikola Tesla (1856-1943), whose work in electromagnetic induction led to the first practical generators and motors using alternating current.

Compiled partly from information located at the
Encyclopedia Britannica on line.
This entry is located in the following unit: Measurements and Mathematics Terms (page 9)