# Year 10+ Measurement

### Chapters

### Common SI Units

# Common SI Units

Scientists use a system of units called the SI units (Système International d'Unités) that have been agreed on so that their work can be understood throughout the world. Most of the SI units are the same as the metric units of measurement, but there are a few differences. In this article, we're going to look at some of the common SI units. The units are split up into two types: base units and derived units. The derived units are built up out of the base units. There are seven SI base units and 22 derived units. There is also a set of twenty prefixes that can be assigned to multiples and fractions of SI units.

## The SI Base Units

Quantity | Unit | Abbreviation |
---|---|---|

Time | second | s |

Length | metre | m |

Mass | kilogram | kg |

Temperature | Kelvin | K |

Electrical Current | Ampere | A |

Amount of Substance | mole | mol |

Luminous Intensity | candela | cd |

## Some Common Derived Units

These units are built from the base units:

Quantity | Unit | Abbreviation |
---|---|---|

Acceleration | metres per second squared | \(\text{m/s}^2\) |

Angle | radians | rad |

Angular Acceleration | radians per second squared | \(\text{rad/s}^2\) |

Angular Velocity | radians per second | rad/s |

Area | square metre | \(\text{m}^2\) |

Density | kilograms per cubic metre | \(\text{kg/m}^3\) |

Energy | Joule | J (Nm) |

Force | Newton | N (\(\text{kgm/s}^2\)) |

Frequency | Hertz | Hz (1/s) |

Impulse | Newton-second | kgm/s |

Moment of Force | Newton-metre | Nm |

Power | Watt | W (or J/s) |

Pressure | Pascal | Pa (or \(\text{N/m}^2\)) |

Velocity | metres per second | m/s |

Volume (solid) | cubic metres | \(\text{m}^3\) |

Volume (liquid) | Litre | L (or \(10^{-3} \text{ m}^3\)) |

Work | Joule | J (or Nm) |

### Description

In these chapters, you will learn more about measurement topics such as

- Metric numbers
- Speed
- Conversions

and several other topics

### Audience

Year 10 or higher, some chapters are suitable for Year 8+ students

### Learning Objectives

Learn about measurement and related topics

Author: Subject Coach

Added on: 28th Sep 2018

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