|Look up tera- in Wiktionary, the free dictionary.|
Tera is a unit prefix in the metric system denoting multiplication by one trillion, or 1012 or 1000000000000 (one trillion short scale; one billion long scale). It has the symbol T. Tera is derived from the Greek word τέρας teras, meaning "monster"; also it resembles tetra, meaning "four" but with the middle letter removed as it is the fourth power of 1000. The unit prefix was confirmed for use in the International System of Units (SI) in 1960.
Examples of its use:
- terahertz radiation: electromagnetic waves within the band of frequencies from 0.3 to 3 THz. Visible light is around 500 THz.
- terabit and terabyte, units used in data storage. Tebi-, or 240 is the closest binary prefix being ≈9.95% greater than 1012.
- 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 (TJ/s).
- terametre (= 1,000,000,000 km): Light travels 1.079 Tm in one hour.
|Prefix||Base 10||Decimal||English word||Adoption[nb 1]||Etymology|
|Name||Symbol||Short scale||Long scale||Language||Derived word|
|tera||T||1012||1000000000000||trillion||billion||1960||Greek||four[nb 2], monster|
- "SI prefixes and their etymologies" . US Metric Association. Retrieved 2021-06-11.
- C. Upward, G. Davidson, The History of English Spelling, Wiley-Blackwell (2011)
Information as of: 10.08.2021 10:14:10 CEST
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