AAT ICAS 2014 ✧ overview of International System of Units (SI)
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- overview of International System of Units (SI)
- table 2014.1 ✧ SI base units
- table 2014.2 ✧ some derived SI units
- table 2014.3 ✧ some derived SI units with special names
- table 2014.4 ✧ some other units designated for use with SI
- table 2014.5 ✧ prefixes for binary multiples
- table 2014.6 ✧ comparison of SI and binary prefixes
overview of International System of Units (SI)
this document provides a general overview of the International System of Units and is not intended as a specification or reference of SI. for references and detailed specifications of SI, please see AAT ICAS 2076.
SI specifies base units and derived units:
table 2014.1 ✧ SI base units
| base quantity | unit name | symbol |
|---|---|---|
| length | meter | m |
| mass | kilogram | kg |
| time interval | second | s |
| electric current | ampere | A |
| thermodynamic temperature | kelvin | K |
| amount of substance | mole | mol |
| luminous intensity | candela | cd |
table 2014.2 ✧ some derived SI units
| derived quantity | unit name | symbol |
|---|---|---|
| area | square meter | m2 |
| volume | cubic meter | m3 |
| speed, velocity | meter per second | m/s |
| acceleration | meter per second squared | m/s2 |
| luminance | candela per square meter | cd/m2 |
table 2014.3 ✧ some derived SI units with special names
| derived quantity | unit name | symbol | alt. exp. |
|---|---|---|---|
| frequency | Hertz | Hz | s-1 |
| force | Newton | N | m ⋅ kg ⋅ s-2 |
| energy, work, quantity of heat | joule | J | N ⋅ m |
| power, radiant flux | Watt | W | J/s |
| electric potential difference, electromotive force | Volt | V | W/A |
| electric resistance | ohm | Ω | V/A |
| Celsius temperature | degree Celsius(d) | °C | °K + 273.16 |
table 2014.4 ✧ some other units designated for use with SI
| unit name | symbol | alt. exp. |
|---|---|---|
| minute | min | 1 min = 60 s |
| hour | h | 1 h = 3600 s |
| day | d | 1 d = 24 h = 86 400 s |
| liter | l, L | 1 l = dm3 = 10-3 m3 (cubic decimeter) |
table 2014.5 ✧ prefixes for binary multiples
| factor | name | symbol | origin | derivation |
|---|---|---|---|---|
| 210 | kibi | Ki | kilobinary: (210)1 | kilo: (103)1 |
| 220 | mebi | Mi | megabinary: (210)2 | mega: (103)2 |
| 230 | gibi | Gi | gigabinary: (210)3 | giga: (103)3 |
| 240 | tebi | Ti | terabinary: (210)4 | tera: (103)4 |
| 250 | pebi | Pi | petabinary: (210)5 | peta: (103)5 |
| 260 | exbi | Ei | exabinary: (210)6 | exa: (103)6 |
table 2014.6 ✧ comparison of SI and binary prefixes
| one kibibit | 1 Kibit = 210 bit = | 1024 bit |
| one kilobit | 1 kbit = 103 bit = | 1000 bit |
| one mebibyte | 1 MiB = 220 B = | 1 048 576 B |
| one megabyte | 1 MB = 106 B = | 1 000 000 B |
| one gibibyte | 1 GiB = 230 B = | 1 073 741 824 B |
| one gigabyte | 1 GB = 109 B = | 1 000 000 000 B |
aatideas.org document updated:
| scale | value | ||
|---|---|---|---|
| UCN | 12011 P09 Violet | ||
| zone(UT) | t408 tt900 | ||
| 'ICAS in use' can accommodate calendar and clock formatting 'for all people, for all time'. | |||
| AD common year day | 039 | ||
| G | 2011 February 08 Tuesday | ||
| UT | 09:48:49 | ||
| style legend | |||
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