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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 in order to facilitate exchanges in the scientific, technological, and educational fields. The table below shows the most commonly used units of measure in science. Some of the basic units of the international system are shown in blue:
| Name of quantity measured | Unit of measurement name | Unit of measurement symbol |
| Area |(A)| | Centimetre squared Metre squared Hectare | |\text{cm}^2| |\text{m}^2| |\text{ha}| |
| Angle (|\theta|) | Degree | |^{\circ}| |
| Distance |(d)| | Millimetre Centimetre Decimetre Metre Kilometre | |\text{mm}| |\text{cm}| |\text{dm}| |\color{blue}{\text{m}}| |\text{km}| |
| Mass |(m)| | Milligram Gram Kilogram Tonne | |\text{mg}| |\text{g}| |\color{blue}{\text{kg}}| |\text{t}| |
| Temperature |(T)| | Degree Celsius Degree Fahrenheit Kelvin | |^\circ \text{C}| |^\circ \text{F}| |\color{blue}{\text{K}}| |
| Time |(t)| | Second Minute Hour | |\color{blue}{\text{s}}| |\text{min}| |\text{h}| |
| Volume |(V)| | Cubic centimetre Cubic metre Millilitre Litre | |\text{cm}^3| |\text{m}^3| |\text{mL}| |\text{L}| |
For other units of measurement, it is possible to consult the following concept sheets:
The International System of Units (SI) provides certain prefixes for multiples and submultiples of units of measurement. The symbol for the new units of measurement formed is then composed of two symbols: that of the multiple and that of 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}| |
| Unit | |10^{0}= 1| | - |
| Déca | |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}| |