ISO 216

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And you can see more from particle board with melamine paper waxed colour paper storage paper anti corrosion vci plastics, paper dn06, printed tissue paper 50g carbonless paper telex paper chemical 46 engineering news multi purpose copy paper ISO 269 sizes(mm mm)C SeriesC0917 1297C1648 917C2458 648C3324 458C4229 324C5162 229C6114 162C7/681 162C781 114C857 81C940 57C1028 40DL110 220ISO 216 sizes(mm mm)B SeriesB01000 1414B1707 1000B2500 707B3353 500B4250 353B5176 250B6125 176B788 125B862 88B944 62B1031 44ISO 216 sizes(mm mm)A SeriesA0841 1189A1594 841A2420 594A3297 420A4210 297A5148 210A6105 148A774 105A852 74A937 52A1026 37ISO 216 specifies international standard (ISO) paper sizes used in most countries in the world today. It is the standard which defines the commonly available A4 paper size. The underlying principle is that when rectangles with width/length ratio are cut or folded in half the rectangles thus formed retain the original width/length ratio.Contents1 History 2 A series 3 B series 4 C series 5 Tolerances 6 A, B, C comparison 7 Application 8 See also 9 References 10 External links // HistoryThe international ISO standard is based on the German DIN standard 476 (DIN 476) from 1922.Some of the formats contained therein were independently invented in France during its revolution, but were later forgotten.[1]The aspect ratio used by this standard was mentioned in a letter by the German Georg Christoph Lichtenberg, written on 25 October 1786.[2]ISO 216:1975, defines two series of paper sizes: A and B ISO 269:1985, defines a C series for envelopes ISO 217:1995, defines two untrimmed series of raw paper sizes: RA and SRA A seriesA size chart illustrating the ISO A series.Paper in the A series format has a aspect ratio, although this is rounded to the nearest millimetre. A0 is defined so that it has an area of 1 m2, prior to the above mentioned rounding. Successive paper sizes in the series (A1, A2, A3, etc.) are defined by halving the preceding paper size, cutting parallel to its shorter side (so that the long side of A(n+1) is the same length as the short side of An, again prior to rounding).The most frequently used of this series is the size A4 (210 297mm). A4 paper is 6mm narrower and 18mm longer than the "Letter" paper size, 8? 11inches (216 279mm), commonly used in North America.The geometric rationale behind the square root of 2 is to maintain the aspect ratio of each subsequent rectangle after cutting the sheet in half, perpendicular to the larger side. Given a rectangle with a longer side, x, and a shorter side, y, the following equation shows how the aspect ratio of a rectangle compares to that of a half rectangle: which reduces to or an aspect ratio of The formula that gives the larger border of the paper size An in metres and without rounding off is the geometric sequence: an = 21 / 4 ? n / 2. The paper size An thus has the dimension an an + 1.The exact millimetre measurement of the long side of An is given by .B seriesA size chart illustrating the ISO B series.The B series formats are geometric means between the A series format with a particular number and the A series format with one lower number. For example, B1 is the geometric mean between A1 and A0. The sides of B0 are 1m to m.There is also an incompatible Japanese B series defined by the JIS. The lengths of JIS B series paper are approximately 1.22 times those of A-series paper.The exact millimetre measurement of the long side of Bn is given by .C seriesA size chart illustrating the ISO C series.The C series formats are geometric means between the B series format with a particular number and the A series format with the same number, (e.g., C2 is the geometric mean between B2 and A2). The C series formats are used mainly for envelopes. An A4 page will fit into a C4 envelope. C series envelopes follow the same ratio principle as the A series pages. For example, if an A4 page is folded in half so that it is A5 in size, it will fit into a C5 envelope (which will be the same size as a C4 envelope folded in half).A, B, and C paper fit together as part of a geometric progression, with ratio of successive side lengths of 21/8, though there is no size half-way between Bn and An+1: A4, C4, B4, D4, A5, ...; there is such a D-series in the Swedish extensions to the system.The exact millimetre measurement of the long side of Cn is...(and so on)


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