Deca
Encyclopedia : D : DE : DEC : Deca
- For other uses, see DECA (disambiguation)}}}.
The SI prefix was adopted by France in 1795 and internationally in 1960. It is not in very common usage. Sometimes written D, Da, or dk, these variants are not defined by the SI.
| 10n | Prefix | Symbol | Short scale | Long scale | Decimal equivalent in SI#SI writing style > SI writing style |
|---|---|---|---|---|---|
| 1024 | yotta | Y | Septillion | Quadrillion | 1 000 000 000 000 000 000 000 000 |
| 1021 | zetta | Z | Sextillion | Trilliard (thousand trillion) | 1 000 000 000 000 000 000 000 |
| 1018 | exa | E | Quintillion | Trillion | 1 000 000 000 000 000 000 |
| 1015 | peta | P | Quadrillion | Billiard (thousand billion) | 1 000 000 000 000 000 |
| 1012 | tera | T | Trillion | Billion | 1 000 000 000 000 |
| 109 | giga | G | Billion | Milliard (thousand million) | 1 000 000 000 |
| 106 | mega | M | Million | 1 000 000 | |
| 103 | kilo | k | Thousand | 1 000 | |
| 102 | hecto | h | Hundred | 100 | |
| 101 | deca, deka | da | Ten | 10 | |
| 100 | (none) | (none) | One | 1 | |
| 10−1 | deci | d | Tenth | 0.1 | |
| 10−2 | centi | c | Hundredth | 0.01 | |
| 10−3 | milli | m | Thousandth | 0.001 | |
| 10−6 | micro | µ (u) | Millionth | 0.000 001 | |
| 10−9 | nano | n | Billionth | Milliardth | 0.000 000 001 |
| 10−12 | pico | p | Trillionth | Billionth | 0.000 000 000 001 |
| 10−15 | femto | f | Quadrillionth | Billiardth | 0.000 000 000 000 001 |
| 10−18 | atto | a | Quintillionth | Trillionth | 0.000 000 000 000 000 001 |
| 10−21 | zepto | z | Sextillionth | Trilliardth | 0.000 000 000 000 000 000 001 |
| 10−24 | yocto | y | Septillionth | Quadrillionth | 0.000 000 000 000 000 000 000 001 |
See also
External links
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