Zepto
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Zepto (symbol z) is an SI prefix indicating a factor of 10-21.
Adopted in 1991, it comes from the Latin septem, which means «seven», since it is equal to 1/10007.
Some examples of its use:
- The electric charge of an electron is 160,2176634 zeptocoulombs (zC).
- A zeptomol (zmol) of a substance contains 602 particles.
- The human insulin molecule has a mass of approximately 10 zeptograms (zg).
- The travel time of a photon through molecular hydrogen is 247 zeptoseconds (zs) for an average link length of molecular hydrogen.
| 1000n | 10n | Prefix | Symbol | Short scale | Long scale | Decimal equity in the prefixes of the International System | Allocation |
|---|---|---|---|---|---|---|---|
| 100010 | 1030 | quetta- | Q | Nonillion | Quintillón | 1 000 000 000 000 000 000 000 000 | 2022 |
| 10009 | 1027 | ronna- | R | Eighth | Mil cuatrillones | 1 000 000 000 000 000 000 000 000 | 2022 |
| 10008 | 1024 | Yotta- | And | Septillion | Cuatrillón | 1 000 000 000 000 000 000 000 | 1991 |
| 10007 | 1021 | zetta- | Z | Sextillion | A thousand trillions | 1 000 000 000 000 000 000 | 1991 |
| 10006 | 1018 | exa... | E | Quintillón | Trillion | 1 000 000 000 000 000 000 | 1975 |
| 10005 | 1015 | peta... | P | Cuatrillón | A billion. | 1 000 000 000 000 000 | 1975 |
| 10004 | 1012 | tera- | T | Trillion | Billion | 1 000 000 000 000 | 1960 |
| 10003 | 109 | giga- | G | Billion | billion / billion | 1 000 000 000 | 1960 |
| 10002 | 106 | mega- | M | Million | 1 000 | 1960 | |
| 10001 | 103 | kilo- | k | Mil / Millar | 1 000 | 1795 | |
| 10002/3 | 102 | Hecto- | h | Hundred / Hundred | 100 | 1795 | |
| 10001/3 | 101 | deca- | da | Ten / Ten | 10 | 1795 | |
| 10000 | 100 | No prefix | One / Unit | 1 | |||
| 1000−1/3 | 10−1 | deci- | d | Tenth | 0.1 | 1795 | |
| 1000−2/3 | 10−2 | centi- | c | Centésimo | 0.01 | 1795 | |
| 1000−1 | 10−3 | mili- | m | A thousandth | 0.001 | 1795 | |
| 1000−2 | 10−6 | micro- | μ | Millions | 0.000 001 | 1960 | |
| 1000−3 | 10−9 | nano- | n | Billionth | One billion dollars | 0.000 000 001 | 1960 |
| 1000−4 | 10−12 | peak... | p | Trillonéimo | Billionth | 0.000 000 000 001 | 1960 |
| 1000−5 | 10−15 | femto- | f | Cuatrillonésimo | Milbillonésimo | 0.000 000 000 000 001 | 1964 |
| 1000−6 | 10−18 | Atto- | a | Quintillonésimo | Trillonéimo | 0.000 000 000 000 000 000 001 | 1964 |
| 1000−7 | 10−21 | zepto- | z | Sextillonésimo | Miltrillonésimo | 0.000 000 000 000 000 000 000 001 | 1991 |
| 1000−8 | 10−24 | Icto- | and | Septillonésimo | Cuatrillonésimo | 0.000 000 000 000 000 000 000 000 000 001 | 1991 |
| 1000−9 | 10−27 | red. | r | Eighth. | Milcuatrillonésimo | 0.000 000 000 000 000 000 000 000 000 000 001 | 2022 |
| 1000−10 | 10−30 | Quecto- | q | Nonillonésimo | Quintillonésimo | 0.000 000 000 000 000 000 000 000 000 000 000 001 | 2022 |
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