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However, a sheet of common copy paper that has a basis weight of 20 pounds (9.1 kg) does not have the same mass as the same size sheet of coarse paper (newsprint). In the former case, the standard ream is 500 sheets of 17-by-22-inch (432 by 559 mm) paper, and in the latter, 500 sheets of 24-by-36-inch (610 by 914 mm) paper.
The measurement data is integrated to eliminate a small-scale formation variation from the measurement result. The measurement value is averaged so that each sensor gives one measurement value per one data box which is typically from 5 mm to one centimeter of web width. For a 1 meter wide web, for instance, 100 - 200 measurement values are taken.
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).
A standard A4 sheet made from 80 g/m 2 paper weighs 5 grams (0.18 oz), as it is 1 ⁄ 16 (four halvings, ignoring rounding) of an A0 page. Thus the weight, and the associated postage rate, can be approximated easily by counting the number of sheets used. ISO 216 and its related standards were first published between 1975 and 1995:
Common sizes include 22 + 1 ⁄ 2 in × 28 + 1 ⁄ 2 in (572 mm × 724 mm) and its bulk thickness is 0.006 inches (0.15 mm) or higher [2] and A4, A3, A2 and A1. [3] [4] Bristol board may be rated by the number of plies it contains, basis weight, or, in Europe, by its grammage of 220 to 250 g/m 2.
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