Units in Science - GCSE Biology
SI base units
It is expected that learners will show understanding of the biological quantities and corresponding units, SI base and derived units listed below.
They will be able to use them in qualitative work and calculations. These units and their associated quantities are dimensionally independent.
SI base units
| Physical quantity | Unit | Symbol |
|---|---|---|
| Length | metre | m |
| Mass | kilogram | kg |
| Time | second | s |
| Temperature | kelvin | K |
| Current | ampere | A |
| Amount of a substance | mole | mol |
SI derived units
SI derived units
| Physical quantity | Unit(s) | Symbol |
|---|---|---|
| Area | squared metre | m2 |
| Volume | cubic metre; litre; cubic decimetre | m3; l; dm3 |
| Density | kilogram per cubic metre | kg/m3 |
| Temperature | degree Celsius | °C |
| Pressure | pascal | Pa |
| Specific heat capacity | joule per kilogram per degree Celsius | J/kg/°C |
| Specific latent heat | joule per kilogram | J/kg |
| Speed | metre per second | m/s |
| Force | newton | N |
| Gravitational field strength | newton per kilogram | N/kg |
| Acceleration | metre per squared second | m/s2 |
| Frequency | hertz | Hz |
| Energy | joule | J |
| Power | watt | W |
| Electric charge | coulomb | C |
| Electric potential difference | volt | V |
| Electric resistance | ohm | Ω |
| Magnetic flux density | tesla | T |