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this post was submitted on 30 Aug 2026
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Oh, let's also remember that A4 is a member of beautiful variant of an "SI system for paper". Want a paper the size of an A4 folded double? We have A~~8~~5. Want something that folds perfectly to A4? A3. One more fold? A2.
Edit: Did a fat-fingering
A4 folded is A5
Yes, I did a typy-type with chubby morning fingers
A85?! That's gotta be minuscule!
with A4's divide-by-two shtick an A85 might unironically have a surface area of only like a couple atoms. it's too late in the night for me to calculate this so i pass this task onto someone else
So, A0 has an area of 1 m^2^ and it's halved for each next one in the series, giving A85 a surface area of 1/(2^85^) m^2^ = 2.585×10^-26^ m^2^ = 0.02585 pm^2^.
The smallest atom is the hydrogen atom with a Van der Waals radius of 120 pm which gives it a surface area of 4×π×120^2^ pm^2^ = 180956 pm^2^ or just over 7 million times larger than the A85.
Funnily enough, a deviation of +- 1.5mm is allowed according to the ISO standard, so it is technically allowed to be much larger than that.