In the study of physics it is important to know a little more about the units of measurement, which are measures of certain quantities.
The International System of Units (SI) is a set of information about the mediated units agreed throughout the world.
In the SI there are some fundamental units, from which other derived units arise.
See the table below, it represents the set of measurement units (considered fundamental units) of the most important quantities in the study of physics.
| UNITY | SYMBOL | GREATNESS |
| subway | m | Length |
| kilogram | kg | Pasta |
| second | s | Time |
| ampere | THE | Electric current |
| kelvin | K | thermodynamic temperature |
| mole | mole | amount of matter |
| radian | rad | flat angle |
From these units there are other derived units such as: area, volume, velocity, acceleration, see some:
Area unit: m . m = m 2
Force Unit: N or kg . m/s 2
Unit of volume: m . m. m = m 3
Pressure Unit: Pa or kg/(m . s 2 )
Speed Unit: m/s
Energy Unit: J or kg . m 2 /s 2
Acceleration unit = m/s 2
Electric charge unit: C or A . s
Prefixes in SI
| PREFIX | SYMBOL | POWER OF 10 EQUIVALENT |
| giga | G | 10 9 |
| mega | M | 10 6 |
| kilo | k | 10 3 |
| hecto | H | 10 2 |
| deca | gives | 10 1 |
| decided | d | 10 -1 |
| cent | ç | 10 -2 |
| milli | m | 10 -3 |
| micro | μ | 10 -6 |
| nano | no | 10 -9 |
| peak | for | 10 -12 |
| femto | f | 10 -15 |
| act | The | 10 -18 |
| zepto | z | 10 -21 |
| yocto | and | 10 -24 |
We can make some representations with these prefixes, see:
0.000003 = 3 . 10-6 s = 3 μs
9 000 000 000 m = 9 . 109 m = 9 Gm
