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Typical office paper has 80 g/m 2 (0.26 oz/sq ft), therefore a typical A4 sheet (1 ⁄ 16 of a square metre) weighs 5 g (0.18 oz). The abbreviation "gsm" instead of the standard g/m 2 symbol is also widely encountered in English-speaking countries .
The weight of an A-series sheet of a given paper weight can be calculated by knowing the ratio of its size to the A0 sheet. For example, an A4 sheet is 1 ⁄ 16 the size of an A0 sheet, so if it is made from 80 g/m 2 paper, it weighs 1 ⁄ 16 of 80 g (2.8 oz), which is 5 g (0.18 oz).
Weighing scale to determine paper weight. Paper density is a paper product's mass per unit volume.The 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 the United States, the weight is the weight of a ream (bundle of 500 sheets) of varying "basic sizes" before the paper is cut into the size it is sold to end customers. For example, a ream of 20 lb, 8.5 in × 11 in (216 mm × 279 mm) paper weighs 5 pounds because it has been cut from larger sheets into four pieces. [ 21 ]
In yarns for handcrafts, such as knitting or crochet, hanks are not a fixed length but are sold in units by weight, most commonly 50 grams (2 oz). Depending on the thickness of the strand as well as the inherent density of the material, hanks can range widely in yardage per 50 gram (2 oz) unit; for example, 440 yards for a lace weight mohair ...
Given the linear density and weight the yarn length can be calculated; for example: l/m = 1693 × l m /Nec × m/kg, where l/m is the yarn length in metres, l m /Nec is the English cotton count and m/kg is the yarn weight in kilograms. The following length units are defined. Bundle: usually 10 lb (4.5 kg)