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GCSE Design and Technology · key term
Grams per square metre: a measure of the mass of paper or board per unit area, not a direct measure of its thickness.
Used by AQA
Paper 1
Revise: Papers and boardsGSM, meaning grams per square metre, measures mass per unit area. A 120 GSM paper has a mass of 120 g for each square metre. It does not directly measure thickness because sheets can have different structures.
Grams per square metre: a measure of the mass of paper, board or fabric per unit area.
Distinguish GSM from thickness: GSM measures mass per unit area; microns and millimetres measure thickness.
Distinguish thickness from weight per unit area. A paper’s gsm value is not a thickness measurement.
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