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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