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Paper density
Paper density measures a paper product's mass per unitvolume. MeasurementThe density can be calculated by dividing the grammage of paper (in grams per square metre or "gsm") by its caliper (usually in micrometres, occasionally in mils). In countries that did not adopt the metric system, paper density is often measured in basis weight. This measuring system expresses the density of paper by weighing a set number of so-called basis sheets.
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