45 lines
No EOL
1.7 KiB
Markdown
45 lines
No EOL
1.7 KiB
Markdown
---
|
|
obj: concept
|
|
wiki: https://en.wikipedia.org/wiki/International_System_of_Units
|
|
---
|
|
|
|
# SI Units
|
|
The International System of Units (SI) is a modern metric system that is widely used in [science](../Science.md), technology, and engineering. It was developed to provide a consistent and coherent framework for measuring physical quantities, and it includes seven base units and several derived units.
|
|
|
|
## Base Units:
|
|
The seven base units of the SI system are:
|
|
- [Meter](units/Meter.md) (m) - length
|
|
- [Kilogram](units/Kilogram.md) (kg) - mass
|
|
- [Second](units/Second.md) (s) - time
|
|
- [Ampere](units/Ampere.md) (A) - electric current
|
|
- [Kelvin](units/Kelvin.md) (K) - thermodynamic temperature
|
|
- [Mole](units/Mole.md) (mol) - amount of substance
|
|
- [Candela](units/Candela.md) (cd) - luminous intensity
|
|
|
|
## Prefixes
|
|
The SI system uses prefixes to represent multiples and submultiples of the base units. Here are some common prefixes used in the SI system:
|
|
|
|
| Prefix | Symbol | Multiple |
|
|
| ------ | ------ | -------------- |
|
|
| atto | `a` | $$ 10^{-18} $$ |
|
|
| femto | `f` | $$ 10^{-15} $$ |
|
|
| pico | `p` | $$ 10^{-12} $$ |
|
|
| nano | `n` | $$ 10^{-9} $$ |
|
|
| micro | `μ` | $$ 10^{-6} $$ |
|
|
| milli | `m` | $$ 10^{-3} $$ |
|
|
| centi | `c` | $$ 10^{-2} $$ |
|
|
| deci | `d` | $$ 10^{-1} $$ |
|
|
| Base | - | $$ 10^{0} $$ |
|
|
| deca | `da` | $$ 10^{1} $$ |
|
|
| hecto | `h` | $$ 10^{2} $$ |
|
|
| kilo | `k` | $$ 10^{3} $$ |
|
|
| mega | `M` | $$ 10^{6} $$ |
|
|
| giga | `G` | $$ 10^{9} $$ |
|
|
| tera | `T` | $$ 10^{12} $$ |
|
|
| peta | `P` | $$ 10^{15} $$ |
|
|
| exa | `E` | $$ 10^{18} $$ |
|
|
| zetta | `Z` | $$ 10^{21} $$ |
|
|
|
|
## Derived Units
|
|
### Electricity
|
|
- [Volt](units/Volt.md) |