The secret of the size of a4 paper

In the past year, while university students in our classes and laboratory work in our group does, and often reports ready. These reports were expected to prepare elaborate. With our friends and sometimes separately, sometimes being collected works, combines what we have done, create reports. At that time one of our major problems in the reporting format used by all of us have different was the size of the broadsheet. Was no standard size. Each package was removed from the different lengths of paper. Even those who would appear to be the same change a few millimeters. I've seen better quality in those years was a measure of the paper boy was saved to my address book (1). I want to take the paper from there with a ruler I measure between stationer's puzzled look. 29 to 21 cm, 7 cm ... If not would not receive. Then the size of paper everywhere began to meet. Everyone now knows this very well was A4 paper.

Many students of computers in the house but most of those years olmadağı calculator technology were wonders. We would not fall. Divided by the size of the paper one day when the most number of 1.4142 was very familiar. This was nothing than 2 square root. If I had done a great invention. However, the rate of such a paper on farkedilmesinin went up 1768'e. Square root of two very simple means. This rate is doubled when you have the long sides of each paper aside for a short stay unchanged was the square root 2.

Importance of the paper at the same rate over 2 square root expanded or reduced to smooth comes from. The advantage of this ratio for the first time a German scientist Georg Lichtenberg 1768'de Written by (2). At the beginning of this century, Dr Walter Porstmann, Lichtenberg'in idea of designing and using a variety of paper sizes in 1922 in Germany as DIN 476 standard was adopted. Use A4 paper size is the most common DIN A4 was called for. This standard has been adopted by many countries. In 1975 he was accepted as international standard (ISO 216). Now almost all countries except the U.S. and Canada, this paper is standard. But when the Americans will someday accept? Their letter size always find I have very absurd, insisting that I believe nothing of the stubbornness.
A4, A0'in 4 times the size of fold is the result. Is in the size 210x297 mm. A0 paper size is designed to 841x1189 mm. This area has a full 1-meter square means. A1: 0, 5, A2: 0, 25, A3: 0, 125, A4: 0, 0625 square meters.
Paper except for the size A, B and C standards was prepared with the same approach are also present. Exponentially with the size definition of B0, and C0 B and C series are formed. B more books size, C is used as the envelope size. (3)
Paper size standard specifically for printers and copier creates great convenience.
(1) in non-mobile phones and addresses of our series, we carry in our pocket books would be small. (2) "Paper size", Wikipedia, http://en.wikipedia.org/wiki/Paper_size (3) Markus Kuhn "International standard paper sizes" http://www.cl.cam.ac.uk/ ~ mgk25/iso-paper.html