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The International System of Units (SI) is an internationally recognized system. It brings together the most commonly used units of measurement to make exchanges in the scientific, technological, and educational fields easier. The table below shows the most commonly used measurement units in physics. In blue are some of the basic units of the international system.
| Name of the quantity measured | Unit of measurement name | Unit of measurement symbol |
| Acceleration |(a)| | Metres per second squared | |\text {m/s}^{2}| |
| Angle | Degree | |^{\circ}| |
| Reminder constant |(k)| | Newtons per metre | |\text {N/m}| |
| Distance |(d)| |
Millimetre
Centimetre
Decimetre
Metre
Kilometre
|
|\text {mm}|
|\text {cm}|
|\text {dm}|
|\color{blue}{\text {m}}|
|\text {km}|
|
| Energy |(E)| |
Joule
Kilojoule
|
|\text {J}|
|\text {kJ}|
|
| Power |(W)| | Watt | |\text {W}| |
| Time |(t)| |
Second
Minute
Hour
|
|\color{blue}{\text {s}}|
|\text {min}|
|\text {h}|
|
| Work |(W)| | Joule | |\text {J}| |
| Vergence |(C)| | Diopter | |\delta| |
| Speed |(v)| |
Metre per second
Kilometre per hour
|
|\text {m/s}|
|\text {km/h}|
|
For other units of measurement, see the following concept sheet:
The International System of Units (SI) provides certain prefixes for multiples and submultiples of units of measurement. The symbol of the new unit of measurement formed is composed of two symbols: the multiple and the unit of measurement.
| Prefix | Power | Symbol |
| Pico | |10^{-12}= 0.000\ 000 000\ 001| | |\text{p}| |
| Nano | |10^{-9}= 0.000\ 000 001| | |\text{n}| |
| Micro | |10^{-6}= 0.000\ 001| | |\mu| |
| Milli | |10^{-3}= 0.001| | |\text{m}| |
| Centi | |10^{-2}= 0.01| | |\text{c}| |
| Deci | |10^{-1}= 0.1| | |\text{d}| |
| Units | |10^{0}= 1| | - |
| Deca | |10^{1}= 10| | |\text{da}| |
| Hecto | |10^{2}= 100| | |\text{h}| |
| Kilo | |10^{3}= 1000| | |\text{k}| |
| Mega | |10^{6}= 1\ 000\ 000| | |\text{M}| |
| Giga | |10^{9}= 1\ 000\ 000\ 000| | |\text{G}| |