Writing Paper Sizes

Writing Paper Sizes-63
Similarly, the formats of the C series are the geometric mean between the A and B series formats with the same number.For example, an (unfolded) A4 size letter fits nicely into a C4 envelope, which in turn fits as nicely into a B4 envelope.

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Therefore, the area of the pages has been defined to have round metric values.

As paper is usually specified in g/m², this simplifies calculation of the mass of a document if the format and number of pages are known.

Calculation of the mass of books, newspapers, or packed paper is equally trivial.

You probably will not need such calculations often, but they nicely show the beauty of the concept of metric paper sizes.

If you open the journal, the two A4 pages that you will now see together have A3 format.

By setting the magnification factor on the copying machine to 71% (that is sqrt(0.5)), or by pressing the A3→A4 button that is available on most copying machines, both A4 pages of the journal article together will fill exactly the A4 page produced by the copying machine. No wasted paper margins appear, no text has been cut off, and no experiments for finding the appropriate magnification factor are necessary.For example, JB3 is 364 × 515, JB4 is 257 × 364, and JB5 is 182 × 257 mm. It introduces additional magnification factors and is not an international standard.The following table shows the width and height of all ISO A and B paper formats, as well as the ISO C envelope formats.The same principle works for books in B5 or A5 format.Copying machines designed for ISO paper sizes usually provide special keys for the following frequently needed magnification factors: Not only the operation of copying machines in offices and libraries, but also repro photography, microfilming, and printing are simplified by the 1:sqrt(2) aspect ratio of ISO paper sizes.The dimensions are in millimeters: The allowed tolerances are ±1.5 mm for dimensions up to 150 mm, ±2 mm for dimensions above 150 mm up to 600 mm, and ±3 mm for dimensions above 600 mm.Some national equivalents of ISO 216 specify tighter tolerances, for instance DIN 476 requires ±1 mm, ±1.5 mm, and ±2 mm respectively for the same ranges of dimensions.If you prepare a letter, you will have to know the weight of the content in order to determine the postal fee.This can be very conveniently calculated with the ISO A series paper sizes.This aspect ratio is especially convenient for a paper size.If you put two such pages next to each other, or equivalently cut one parallel to its shorter side into two equal pieces, then the resulting page will have again the same width/height ratio.

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