Yocto-
Look up yocto in Wiktionary, the free dictionary.
Yocto- (symbol y) is a unit prefix in the metric system denoting a factor of 10−24 or 0.000000000000000000000001.
It was adopted in 1991[1] by the General Conference on Weights and Measures. It comes from the Latin/Greek [octo] Error: {{Lang}}: text has italic markup (help) (οκτώ), meaning "eight", because it is equal to 1000−8. Yocto- is the smallest official SI prefix.
It can be used to state a subatomic particle's mass, for example:
Rest mass of electron: 0.000911 yg Rest mass of proton: 1.6726 yg Rest mass of neutron: 1.6749 yg Atomic mass unit: 1.6605 yg
| Prefix | Symbol | Factor | Power |
|---|---|---|---|
| tera | T | 1000000000000 | 1012 |
| giga | G | 1000000000 | 109 |
| mega | M | 1000000 | 106 |
| kilo | k | 1000 | 103 |
| hecto | h | 100 | 102 |
| deca | da | 10 | 101 |
| (none) | (none) | 1 | 100 |
| deci | d | 0.1 | 10−1 |
| centi | c | 0.01 | 10−2 |
| milli | m | 0.001 | 10−3 |
| micro | μ | 0.000001 | 10−6 |
| nano | n | 0.000000001 | 10−9 |
| pico | p | 0.000000000001 | 10−12 |