Zetta is evocative of the Latin numeral septem, meaning seven. Therefore it was used to denote the seventh power of 1000.
A prefix of the same value, hepta, was informally introduced a few years before the promulgation of zetta. It was formed from the Greek ἑπτά, (hepta), also meaning seven. Hepta never received official sanction and is obsolete. Zeta (Ζήτα), although being the 6th letter of the Greek alphabet, denotes a value of seven (7) when used as a numeral.
- The mass of Earth's atmosphere is approximately 5 zettagrams (Zg).
- The volume of seawater in the Earth's oceans is approximately 1.369 zettalitres (ZL).
- Avogadro's constant is 602.2 zetta mol−1.
- A zettabyte is a quantity of information or information storage capacity equal to 1021 bytes or 1,000 exabytes.
- The metric system was introduced in 1795 with six prefixes. The other dates relate to recognition by a resolution of the CGPM.
- "Resolution 4 of the 19th CGPM (Conférence Générale des Poids et Mesures)". BIPM (Bureau International des Poids et Mesures). Retrieved 2009-05-16. "Les noms zepto et zetta évoquent le chiffre sept (septième puissance de 103) et la lettre « z » remplace la lettre « s » pour éviter le double emploi de la lettre « s » comme symbole. The names zepto and zetta are evocative of the numeral sept (seventh power of 103) and the letter 'z' is substituted for the letter 's' to avoid the duplicate use of the letter 's' as a symbol."
- Compare zebibyte which is a multiple of 1024 as typical unit for information storage.
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