Tera-
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Look up tera- in Wiktionary, the free dictionary. |
Tera is a unit prefix in the metric system denoting multiplication by 1012 or 1000000000000 (one trillion short scale; one billion long scale). It has the symbol T. Tera is derived from Greek word τέρας teras, meaning "monster". The prefix tera- was confirmed for use in the SI in 1960.
Examples of its use:
- terahertz radiation: electromagnetic waves within the band of frequencies from 0.3 to 3 THz
- terabit, tebibit, terabyte and tebibyte, units used in data storage.
- teragram: equal to 109 kg. The Great Pyramid of Giza has a mass of about 6 Tg.
- terasecond: approximately 31,558 years
- teralitre: equal to 109 m3. Lake Zurich contains about 4 TL of water.
- terawatt: used to measure total human energy consumption. In 2010 it was 16 TW.
- terametre (= 1,000,000,000 km): Light travels 1.079 Tm in one hour.
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- ↑ The metric system was introduced in 1795 with several metric prefixes, of which, however, only six were adopted as SI prefixes by the 11th CGPM conference in 1960, whereas myria (104) as well as double and demi were not adopted. In 1873, micro and mega were recommended by the British Association for the Advancement of Science. The other dates relate to recognition by a resolution of the CGPM.