NanoraptorMar 13

iso paper sizes are delicious: sides are 1:sqrt2 or about 1:1.414

A4 is 210x297mm

A4 folded in half is 148x210 or A5.

A3 is two A4s, or 297x420

go to A0 841x1189 or one square metre.

A-1 (A Minus One) is 2 square metres.

Australia is ~A-43

The visible universe ~A-179

A proton about A139.

A Quark? A151

Presumably A232 is one dimensional though, as it's planck length on the long edge.

Show threadTommy ÞMar 14

@NanoRaptor I hail from a Metric country and have always been mystified by the backwards ways of the USA. However, I was today's year old when I learned that A0 was a square meter! Well, it _had_ to be, right?

(I made made notebooks in my youth by subdividing A4 pages, the _absolute_ standard size in the civilized world).

Show threadArthur van der HargMar 16
@tommythorn @NanoRaptor Let me blow your mind some more: the standard paper weight is so-called 80 gram. Standard letter postage in most countries is for 20 gram letters. Why the 20 gram? 20 gram is two sheets of 80 gram A4 paper plus a C5 envelope. It all ties together.
Show threadTommy Þ

@ArtHarg @NanoRaptor Meanwhile here we have a mile, defined as 8 furlongs, which are 220 yards each, that being 3 feet, and those are 12 inches.

We can do better: tyres specifications are a lovely mix of metric, fractional, and imperial. (At least we don't have to deal with stones).

Mar 27 at 4:28pmWeb