OCR GCSE Chemistry B · J258
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: SI unitsThe International System of Units, abbreviated to SI, provides a shared measurement language. Using agreed units allows results collected by different people to be compared and processed without ambiguity. OCR requires SI units to be used where appropriate: the unit should suit both the quantity being measured and the scale of the values.