Appropriate Units for Measurements (OCR A Level Physics): Revision Note
Exam code: H556
Appropriate Units for Measurements
It is essential that the correct scientific measurements are used when discussing experiments in physics
Ensure that the correct symbols are used in conjunction with the unit of measurement
E.g. m3 for cubic metres
Units of Measurement Table
Measurement | Base unit | Symbol | Units used |
|---|---|---|---|
Length | metre | m | 1000 m = 1 km; 0.01 m = 1 cm; 0.001 m = 1 mm; 0.000001 m = 1 μm |
Volume | cubic metre | m³ | 10⁹ m³ = 1 km³; 0.000001 m³ = 1 cm³; 10⁻⁹ m³ = 1 mm³; 10⁻¹⁸ m³ = 1 μm³ |
Volume | cubic decimetre | dm³ | 0.001 dm³ = 1 cm³; 0.000001 dm³ = 1 mm³ |
Area | square metre | m² | 10000 m² = 1 ha; 0.0001 m² = 1 cm² |
Mass | kilogram | kg | 1000 kg = 1 tonne; 0.001 kg = 1 g; 0.000001 kg = 1 mg; 10⁻⁹ kg = 1 μg |
Time | second | s | 60 s = 1 min; 60 min = 1 hour |
Pressure | pascal | Pa | 1000 Pa = 1 kPa |
Energy | joule | J | 1000 J = 1 kJ; 1000000 J = 1 MJ |
Temperature | kelvin | K | — |
Amount of substance | mole | mol | 0.001 mol = 1 millimole |
Note:
cm3 is the same as millilitre (ml)
dm3 is the same as litre (l)
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