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2. Grammage - Wikipedia

   en.wikipedia.org/wiki/Grammage

   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.

3. Paper size - Wikipedia

   en.wikipedia.org/wiki/Paper_size

   The international paper size standard is ISO 216. It is based on the German DIN 476 standard for paper sizes. Each ISO paper size is one half of the area of the next larger size in the same series. ISO paper sizes are all based on a single aspect ratio of the square root of 2, or approximately 1:1.41421. There are different series, as well as ...

4. Printing and writing paper - Wikipedia

   en.wikipedia.org/wiki/Printing_and_writing_paper

   The ISO 216:2007 is the current international standard for paper sizes, including writing papers and some types of printing papers. This standard describes the paper sizes under what the ISO calls the A, B, and C series formats. [2] Not all countries follow ISO 216. North America, for instance, uses certain terms to describe paper sizes, such ...

5. Paper - Wikipedia

   en.wikipedia.org/wiki/Paper

   In Europe and other regions using the ISO 216 paper-sizing system, the weight is expressed in grams per square metre (g/m 2 or usually gsm) of the paper. Printing paper is generally between 60 gsm and 120 gsm. Anything heavier than 160 gsm is considered card. The weight of a ream therefore depends on the dimensions of the paper and its thickness.

6. ISO 216 - Wikipedia

   en.wikipedia.org/wiki/ISO_216

   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.

7. Paper density - Wikipedia

   en.wikipedia.org/wiki/Paper_density

   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). [1] The "ISO 534:2011, Paper and board — Determination of thickness, density and specific volume" indicates that the paper density is expressed in grams per cubic centimeter (g/cm ...