SI Units, Prefixes and Conversions | A-Level Physics

Why can 2.7 g/cm³ and 2700 kg/m³ describe exactly the same density? This A-level Physics lesson explains the measurement skills that appear throughout the course: the SI base units required for AQA AS and A-level Physics -how derived units such as the newton and joule are built -prefixes including kilo, mega, micro, nano and pico -standard form and powers of ten -a reliable method for converting units -why squared and cubed conversions catch students out -converting between joules and electronvolts -converting between joules and kilowatt-hours -checking whether a final unit and order of magnitude make sense The central method is: BUILD the unit → SCALE the number → CONVERT carefully This is the first lesson in the InkPhysics measurements series. See here for the online notes: https://inkphysics.co.uk/physics/meas... Next lesson: Uncertainty and Error [   • Uncertainty and Error Explained | AQA A-Le...  ] Measurements and Maths playlist: [   • A Level Measurements and Maths| InkPhysics  ] Which conversion causes you the most trouble? prefixes cm² to m² cm³ to m³ electronvolts kilowatt-hours #ALevelPhysics #SIUnits #PhysicsRevision