First, they are not the same size.
The size of 1 and A4 paper is 21* 29.7cm (210mm× 297mm).
2.4 Paper mouth size: 389mm*546mm and 444mm*597mm.
Second, the standards are different.
1, A4 paper is defined by ISO 2 16 of the International Organization for Standardization, and its specification is 21* 29.7cm. Most countries in the world have adopted this international standard for paper size.
The naming of 2.4K paper is a custom in China, which mainly aims at the specifications and standards of China cultural paper (such as sketch paper and calligraphy paper).
First, the basis of their formulation is different.
The basis of making series 1 and a is to find a piece with an aspect ratio of √2 and an area of 1 m2 (m? ) paper. Therefore, the width and length of this piece of paper are 84 1mm and189 mm (aspect ratio √2: 1) respectively, and the number is A0.
If the long side of A0 paper is divided into two, two sheets of A 1 paper are obtained, both of which are 594 mm in width and 84 1 mm in length. If A 1 paper is cut in this way, paper sizes such as A2, A3 and A4 can be obtained in turn.
2.787× 1092 mm flat base paper is the main specification of cultural paper in China at present, and most of the existing papermaking and printing machines in China produce and apply this specification of paper. In China, it is customary to use geometric series to name folio. After being folded in half, the size of the whole paper is two-fold, and then folded in half is 4 quarts.
Baidu Encyclopedia -4 opens a paper
Baidu encyclopedia -A4 paper