| Prefix | Name | Factor |
|---|---|---|
| E | exa | 1018 |
| P | peta | 1015 |
| T | tera | 1012 |
| G | giga | 109 |
| M | mega | 106 |
| k or K | kilo | 103 |
| h or H | hecto | 102 |
| D | deka | 101 |
| d | deci | 10-1 |
| c | centi | 10-2 |
| m | milli | 10-3 |
| µ | micro | 10-6 |
| n | nano | 10-9 |
| p | pico | 10-12 |
| f | femto | 10-15 |
| a | atto | 10-18 |
In a unit string you can precede a built-in unit by a prefix indicating a power of ten. For example, ``mm'' indicates ``millimeter'', or meter x 10-3 (one thousandth of a meter). The table above lists the prefixes recognized by FARM.EXE.
Most prefixes used by FARM.EXE correspond with the standard international system of units. The one exception is ``deka'', which is ``D'' in our notation, but ``da'' in standard notation.
NOTE: You can't use a prefix with a unit if the resulting combination would match a built-in unit. For example, you can't use ``min'' to indicate milli-inches because ``min'' is a built-in unit indicating minutes. Other possible combinations that would match built-in units are: ``Pa'', ``cd'', ph'', ``flam'', ``nmi'', ``mph'', kph'', ``ct'', ``pt'', ``ft'', ``au'', and ``cu''.