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In order to keep figures short and presentable, SI prefixes are often attached to units such as m (meter) or g (gram).
For example, a substance weighing 0.000 000 001 g may be described more simply as 1 ng (nanogram) or as 1000 pg (picograms).
Common prefixes of the International System of Units (SI) are:
| p | pico | = 1 000 000 000 000th | = 10-12 |
| n | nano | = 1 000 000 000th | = 10-9 |
| µ | micro | = 1 000 000th | = 10-6 |
| m | milli | = 1 000th | = 10-3 |
| no prefix | = 1 | ||
| k | kilo | = 1 000 | = 103 |
| M | Mega | = 1 000 000 | = 106 |
| G | Giga | = 1 000 000 000 | = 109 |
| T | Tera | = 1 000 000 000 000 | = 1012 |
Español: Prefijos de las Unidades de Medida
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