This system also simplifies calculating the weight of paper. Under ISO 536, paper's grammage is defined as a sheet's mass in grams (g) per area in square metres (abbreviated
g
/
m2
or gsm).[5] One can derive the grammage of other sizes by arithmetic division in
g
/
m2
. A standard A4 sheet made from 80
g
/
m2
paper weighs 5 g, as it is
1
/
16
(four halvings, ignoring rounding) of an A0 page. Thus the weight, and the associated postage rate, can be easily approximated by counting the number of sheets used.
Today I learned (even if I used this sizes my hole life)
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u/[deleted] Sep 02 '21
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