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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).
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 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, which is 5 g.
The sizes of the RA series are also slightly larger than corresponding inch-based US sizes specified in ANSI/ASME Y14.1, e.g. RA4 is roughly equivalent to 8 + 1 ⁄ 2 in × 12 in (220 mm × 300 mm) and ANSI A (alias US Letter) is defined as 8 + 1 ⁄ 2 in × 11 in (220 mm × 280 mm).
One ream of 20-pound Letter-sized paper weighs 5 pounds (2.3 kg), and a single Letter-sized sheet of 20-pound paper weighs 0.16 ounces (4.536 g), which is equivalent to 75.19 g/m 2. Some metric information is typically included on American ream packaging. For example, 20-pound paper is also labeled as 75 g/m 2.
Paper may be between 0.07 and 0.18 millimetres (0.0028 and 0.0071 in) thick. [20] Paper is often characterized by weight. 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.
Most nations describe paper in terms of grammage—the weight in grams of one sheet of the paper measuring one square meter.. Other people, especially in the United States, describe paper in terms of pound weight—the weight in pounds per ream (500 sheets) of the paper with a given area (based on historical production sizes before trimming): for card stock, this is 20 by 26 in (508 by 660 mm ...
Paper sizes: Withdrawn: DIN EN ISO 216: ISO 216: DIN 476-2: Trimmed Sizes of Paper – C Series: Active: DIN 477-1: Gas cylinder valves for cylinder test pressures up to 300 bar – Part 1: Valve inlet and outlet connections: Active: DIN 479: Square head bolts with short dog point: Active