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A quire of paper is a measure of paper quantity. The usual meaning is 25 sheets of the same size and quality: 1 ⁄ 20 of a ream of 500 sheets. Quires of 25 sheets are often used for machine-made paper, while quires of 24 sheets are often used for handmade or specialised paper of 480-sheet reams.
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). B series [ edit ]
So, the 17-by-22-inch (432 by 559 mm) ream became commonly used. The 25-by-38-inch (635 by 965 mm) book-paper ream developed because such a size can easily be cut into sixteen 6-by-9-inch (152 by 229 mm) book sized sheets without significant waste (nominally 6 + 1 ⁄ 4-by-9 + 1 ⁄ 2-inch (159 by 241 mm) before trimming and binding).
Thus, one ream of twenty-pound letter-size paper has a mass of five pounds. The metric unit for paper thickness, or grammage, is grams per square metre. Since 1 pound is 453.59237 grams, 1 inch is 25.4 mm, and 1 standard ream is 500 sheets of 17 in.×22 in., a paper thickness of 20 pounds per ream corresponds to 75 g/m².
The Reagan administration made Letter-size paper the norm for US federal forms in the early 1980s; previously, the smaller "official" Government Letter size, 8 by 10.5 inches (203.2 by 266.7 mm) (aspect ratio: 1.3125), was used in government, while 8.5-by-11-inch (215.9 by 279.4 mm) paper was standard in most other offices. [2]
Bond paper is a high-quality durable writing paper similar to bank paper but having a weight greater than 50 g/m 2. The most common weights are 60 g/m 2 (16 lb), 75 g/m 2 (20 lb) and 90 g/m 2 (24 lb). The name comes from its having originally been made for documents such as government bonds.
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