B Series
The B series are defined in the standard as follows: "A subsidiary series of sizes is obtained by placing the geometrical means between adjacent sizes of the A series in sequence." The use of the geometric mean means that each step in size: B0, A0, B1, A1, B2 … is smaller than the previous by an equal scaling. In a similar manner to the A series; the lengths of the B series still have the ratio, and folding one in half gives the next in the series. The shorter side of B0 is exactly 1m.
There is also an incompatible Japanese B series which the JIS defines to have 1.5 times the area of the corresponding JIS A series (which is identical to the ISO A series). Thus, the lengths of JIS B series paper are times those of A-series paper. By comparison, the lengths of ISO B series paper are times those of A-series paper.
For the ISO B series, the exact millimetre measurement of the long side of B is given by .
Read more about this topic: ISO 216
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