Chemistry › Section A · Essential ideas › Topic A.4
Measurements and units
A number without a unit is useless, and a unit read wrongly can be disastrous. This topic sets out the international system of units that every chemist uses, the prefixes that scale them, and density, the first quantity built from them.
In this topic
- Every measurement has three parts
- Scientific notation
- The SI base units
- Prefixes scale the units
- Length, mass and time
- Temperature in kelvin and Celsius
- Volume, a derived unit
- Density
- Worked example: density of a block
- Worked example: density by displacement
- Common mistakes to avoid
- Key takeaways
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