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GCSE Chemistry · key term
A standard letter or group of letters representing a unit, such as g for gram or J for joule.
Used by OCR
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: SI unitsUnit symbols follow fixed conventions. Their capitalisation matters: joule is written J, while gram is written g. Prefixes and units are joined into one symbol, such as kg, mg, km, mm and kJ.
Keep unit symbols case-sensitive: write kg, g, mg, km, m, mm, kJ and J exactly as shown.
Leave a space between a value and its unit, for example , and do not pluralise unit symbols.
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