Talk:ISO 216

B rationale

The definition, or rationale, given for the B series, is bizarre: geometric means between the A series format with a particular number and the A series format with one lower number. Perhaps that's true, but is this really the reason the B series was invented, or useful? Isn't a more useful explanation is that while the A0 was defined to have an area of 1m^2, the B0 was defined to have a (short) side of 1m? 192.114.107.4 (talk) 07:55, 7 April 2009 (UTC)

Root 2 rationale

I made a change to the rationale for using 1:sqrt(2) rationale for A paper as well as the inclusion of a few equations for proof. If someone can take a look at the changes and see whether or not they agree, I'd appreciate. I found the previous explanation to be badly written and confusing.Kakomu (talk) 21:15, 9 September 2008 (UTC)

Merge Silver rectangle into ISO 216?

I propose the merger for two reasons:

1. There is little that can be said about silver rectangles. Unlike golden rectangles, which are alleged to crop up everywhere and have a distinguished history, silver rectangles are of limited interest. The folding property should be described at ISO 216 anyway.
2. The name "silver rectangle" is both ambiguous and unfortunate. It is unfortunate because it is not a rectangle with the proportions of the silver ratio, as is suggested by the golden ratio/golden rectangle analogy. It is ambiguous because it is sometimes defined by root2 and sometimes by 1+root2 (the silver ratio), and there are not enough references to determine which is more common. I think the solution is to endorse neither, but to acknowledge in both ISO 216 and Silver ratio that they both have some claim to the name "silver rectangle".

Okay, I'm done. Melchoir 03:30, 21 March 2006 (UTC)

I think this is a good idea rafael.cosman

Okay, I'll get on it. Melchoir 04:18, 24 March 2006 (UTC)

Done. Rather than redirect Silver rectangle to either usage, I've made a somewhat unorthodox disambiguation page out of it. Melchoir 04:33, 24 March 2006 (UTC)

Inches

I propose that someone add inch equivalents to these measurements because Americans can't just see a measurement like 200mm and know how long that is. 71.227.254.181 23:57, 2 November 2006 (UTC)

Come on! Join the 21st century. We use millimetres and celcius now. It's beautiful. Come with us. Or get off your mental backside and learn the conversions and invest in a $1.99 pocket calculator. Write them on the back of it with a "sharpie" if you have to. A lot of us have had to learn how many metric units there are to an inch (25.41mm), foot (30.49cm), yard (91.48cm), mile (1609.3m), UK pint (568.3ml), US pint/standard lb (454.6ml/g), ounce (28.38g), UK gallon (4.546L), US gallon (3.637L) ... ETCETERA. It's not difficult. Half of those were off the top of my head. Half of them were derived with a few seconds work in Windows Calculator.

Also, if you're that bothered, why not just work 'em out yourself? Even Google will do the sums these days if you go to their online converter. (Sorry for the bile, but, god-damn... centre of the universe or what... we're working in SI units here. The measurements of science and international commerce. There'll be people in malaysia or somewhere wanting it in their old school units as well next) 193.63.174.10 (talk) 11:18, 23 October 2008 (UTC)

Why single out Americans for special treatment? This is an international English encyclopedia.

Although I'm all for making Wikipedia as accessible as possible, I must admit that I can't seem to muster any compassion for someone who doesn't know what a mm is. Shinobu 09:46, 16 November 2006 (UTC)

Let them have their inches. I can relate to the frustration, as everytime I come across an imperial measurement, I need to use google to convert it into something I can cope with. Hence, I usually add change it to SI units with imperial units in parenthesis when I come across it; no reason why we shouldn't add imperial units even when they're not present. The absence of a dual standard can make people campy about it, leading to articles that are either useless to Americans and akward for older Brits, or articles that are useless to the rest of the world. Zuiram 01:00, 16 December 2006 (UTC)

Question: should the inch equivalents be based on the A4 rounded measurements or the formula? Using the formula there is a difference (due to a rounding error) for a few of the inch values. Jw6aa 03:47, 12 February 2007 (UTC)

Answer: From a practical point of view, the inch equivalent should be based on the final measurements, not the formula. The ISO 216 is not for theoretical use but for printing and the like, where the final page size is all that matters in the end. - Tommi Kovala (unregistered user) 10:38, 21 March 2007 (GMT)

There shouldn't be any conversion to the Imperial system. The rest of the world has gotten up to time in a practical system and american isn't special or anything. -30 is 0 celsius, which is easier? Was the guy who thought of that on opium (then again, he probably was)

Psst, it's 32'F ;-) —Preceding unsigned comment added by 193.63.174.10 (talk) 11:19, 23 October 2008 (UTC)

Why two duplicate tables

The table on the left should be deleted. The lower table is really very nice, but the drawings should be scaled consistently. jcp 05:38, 5 April 2007 (UTC)

Mistakes??

I'm pretty sure that the side parallel to the shorter side is another one of the shorter sides. I think probably perpendicular is what is meant.

Well, there's two ways to give the direction of a fold - give the direction of the crease, or of the folding motion. This, of course, makes both ways pretty useless. It should probably be phrased "by halving the preceding paper size's longer dimension," or such. Darekun 03:34, 17 July 2007 (UTC)

2007 Revision

Note that a Second Edition has been published as of 2007. I can't find information about what the revisions are, but someone should find out and update the article. —Preceding unsigned comment added by 69.46.127.11 (talk) 17:20, 10 September 2007 (UTC)

X vs. Y or Y vs. X

For example, in the table with the various paper sizes "A4= 210 x 297". This is "x" by "y", or let's call it "length x height." Then we see "A3 = 297 x 420" or "y" by "x" or "height" by "length." This information is formatted the same way on almost any page on the Internet I could find, many of which had "pre-Wikipedia" feel to them, so I'm not questioning the accuracy at all. Is there a standard (ISO, ANSI, DIN, etc.) for the order for giving length and height measurements? (use "height" as a replaceable term for "width" if necessary). I notice that A3 has a horizontal orientation while A4 has a vertical orientation, and they give their "x" and "y" dimensions oppositely. Any significance to that? I know that putting an A4 sheet in front of a drafter in vertical orientation would earn you a weird look from him, so the orientation's aren't arbitrary.

On a side note, is there a standardization for whether "width" or "height" is the correct term for the "y" dimension?

Also, is there a standard order for quoting length and height/width in general? It seems like the natural order would be length (x) by width/height (y), being that human field of vision is significantly more horizontally oriented than vertically, so I was surprised to see A3 (and the other "fat" sizes) given with "y" dimension first. Being that drawing/drafting standards are as ambitious as they are, I can't imagine that no one has thought of this aspect B4. (my apologies for both of those awful, awful paper standardization puns). —Preceding unsigned comment added by 68.38.154.77 (talk) 00:46, 15 September 2007 (UTC)

The "orientation" of A3 isn't in any way different from A4. It's just displayed horizontally in the image to fit all the sizes neatly in to same rectangle. Ossi 14:05, 8 November 2007 (UTC)

• I have seen a lot of aspect ratios given as "longer side : shorter side". Any reason why not to do this here? TrueColour (talk) 00:59, 9 October 2008 (UTC)

Sounds sensible, given that the ISO sizes don't truly HAVE a "width" or "height" to them - you can orient the paper in landscape or portrait to suit your own needs. It just defines that one of the dimensions is "so much", and the other is a second figure. 193.63.174.10 (talk) 11:12, 23 October 2008 (UTC)

See Main Page....

there is a link to the main page on the sub-section on A4, but it's not a link.

can someone who isn't a code-noob (thats me) make this work properly!

thanks! —Preceding unsigned comment added by 128.243.253.111 (talk) 18:24, 6 February 2008 (UTC)

Formula looks broken?

I can't see the purpose of the " + 0.2 " in the formula which is described as yielding the "exact millimeter measurement" of the paper (the one with 1000/(...)) in it. Am I missing something? (I've never edited a wikipedia page before so am not about to try now :-). Neil Conway —Preceding unsigned comment added by 194.81.223.66 (talk) 13:33, 7 February 2008 (UTC)

A00 paper?

Why not mention of A00 paper? It is in common use in draughting offices.

Sooo... how big is that? Presumably 2x the A0 size, so 1682 x 1189?

Also, the C sizes are not covered by ISO 216 and should only be referenced from these page. No detailed description necessary. 79.77.113.193 (talk) 20:22, 19 April 2008 (UTC)

Thickness

How thick/thin is A4 paper - 1mm/1μm/1nm/1pm?

Materials

Are material properties the only contraints for paper thinness?

Tools

Is there any special pen/ink to write on thinner papers?

Laws

Is there any minimum limit on thinness of paper to be accepted as evidence in a court of law?Anwar (talk) 09:15, 9 May 2008 (UTC)

What a bizarre set of questions. I'm afraid I can't give any answer for the law court thing, but for the rest, a braindump: For thinner paper I guess you'd use an oil-based ink (ie a Bic ballpoint rather than a fountain pen) and ultimately a soft pencil and a very gentle touch both to avoid the marks passing all the way through, or even tearing it. There's no defined thickness as far as I know in the ISO standards - these are simply measurements of 2D area / dimensions (width x height - thickness is far less important and easier to account for when designing a poster - or a printer - for example). How thick your paper is, and indeed even what it's made out of, pretty much depends on its intended use, and how much you're willing to pay. Thicker stuff made from better materials (e.g. with some parchment linen in the mix, less destructive bleaches, watermarks, inkjet compatible coatings) tends to cost disproportionately more. Also a paper grade tends to be measured more in terms of its density (in grammes per square metre for a single sheet) rather than its true thickness, as the latter can be fairly variable across the page (as its made up of lots of not 100% uniformly fitting fibres) and isn't that good an indicator of the ultimate quality or even the difficulty in transporting and in using the stuff (feeding it thru a printer or folding up to post in an envelope, say). General writing paper, such as in a student's A4 notepad, tends to be relatively thin, under 80gsm (50gsm or less?), and I'd estimate the thickness of a typical page around 100 microns (100um, or 0.1mm)... just enough to allow you to legibly write on both sides with a ballpoint, or a lightly applied fibretip/fountain pen. Typical printer paper is about 80 to 100gsm (for types that let you fit all of a 500-sheet ream into a laser printer bin), and premium writing or printer paper can go as high as 160gsm (typically the highest a mainstream printer allows, and sometimes you have to manually set a certain lever for it to fit - with settings for sub-100, 100-160gsm paper, and envelopes). You can test these figures for yourself better than I can thought-exercise them though... grab a set of scales and a ruler, and a known quantity of the material in question, and set-to. EG a 100 page writing pad (should measure about 1cm high with a moderate weight on top to squeeze out air from between the pages (100um x 100), and weigh about 500g --- 1 sq m for A0 = 1/16 sq m for A4, multiply by 80 and again by 100), or a 500-page ream of A3 printer paper (6.25kg for 100gsm, and maybe 6.25cm high industrially compressed into its packet). Have fun, hope this helps. 193.63.174.10 (talk) 11:01, 23 October 2008 (UTC)

Oops. Missed a bit. I don't know what you mean by the material properties being the only constraints on paper thickness, but at a guess .... yes, they are at least the main ones. Given what materials we have available to make paper & similar products from, there's a particular range of thicknesses that are useful for certain things for each type. EG parchment is very thick, but so brittle that it couldn't sensibly be much thinner, and you wouldn't dare fold it (hence, scrolls as storage). Normal mass produced paper is conversely pretty thin because of its more flexible nature, making it quite a bit more useful and versatile... in some cases it's made about as thin as it usefully can be (I've owned notepads where you could only sensibly write on one side ... with a pencil... and below that even we have tracing paper, tissue paper, etc). However it tends to be pretty absorbent, so for some uses like writing with a water-based ink pen or inkjet printing, better stuff has be used, and the addition of e.g. linen to the mix (letter writing paper) or special coatings (inkjets) makes it a bit thicker, stiffer (which can cause problems with some equipment or envelopes), and more expensive. Then there's poster card, projector transparencies (actually pieces of acetate plastic, but still using the ISO sizes), etc, which tend to be sold at the general 160gsm max for home/office machine use --- which is another definite constraint, as the mechanisms and sheer physical size of a device can only cope with a certain thickness and stiffness of substrate before they start pushing into industrial size/cost/etc territory --- or thicker for manual use only. Then onwards to actual cardboard and corrugated card, etc, which is a whole other area but still technically speaking really thick, strong paper that requires specialist printing (and cutting) techniques.

And that's about the limits of my knowledge so far as paper is concerned, from a quarter century lifetime of working and playing with the stuff to a minor-moderate extent (lots of printing, cutting, folding, and occasional administering because of schoolwork and then certain jobs). Why so interested? :D 193.63.174.10 (talk) 11:10, 23 October 2008 (UTC)

Suggest merge of Duplicate pages

This page and the Paper size page appear to have the same purpose / function and contain much of the same information. I suggest they be merged. —Preceding unsigned comment added by 88.106.221.168 (talk) 11:45, 25 August 2008 (UTC)

out of interest - A/B/C 8,9,10 sizes?

Anyone actually ever seen one of these up close? Unless they're used for defining the size of raffle tickets and the like, I can't see much call for anything under A8... Particularly not the envelopes! (I think I bought a novelty A8-ish size set of christmas cards with envelopes once - they fit ok, but were a bit fiddly to write and I wouldn't dreamt of trying to post them; A10 is almost stamp sized! Also I have an A7 notebook I bought because I spotted it going cheap in a trinket shop when on a trip and it had a nice design ... it proved to be very difficult to actually use! A6 is a lot more common (file cards, shorthand notebooks etc).

Not complaining or asking for removal, I'm just interested to hear if anyone actually uses such things in daily life or industry. 193.63.174.10 (talk) 11:23, 23 October 2008 (UTC)

add brief explanation of DL envelope?

...or is this explained on its own page somewhere (to which we should link)?

I know what it is - wide and high enough that a piece of A4 folded into 3 along its long edge will fit neatly inside, typically for short missives with a max of about five pages... e.g. restaurant menus or other landscape type promo material, or a portrait letter / invoice / etc, typically with part of the letterhead (containing the recipient's name, mailing address and any other immediately relevant info) then being visible through a clear plastic window on the front, and the main content safely folded away on the other 2/3rds and not able to be shaken into view. But there's not even a short expo like that, and I'm not sure immediately where to or whether to include it 193.63.174.10 (talk) 11:30, 23 October 2008 (UTC)

Envelope sizes

Isn't the B-sizes generally used for envelopes? I vaguely remember using a B4-envelope to mail forms that shouldn't be folded, and B5-envelopes for "normal" folded letters written on A4-sheets. Should this be mentioned? —Preceding unsigned comment added by 92.251.150.23 (talk) 23:02, 11 April 2009 (UTC)

History of Adoption?

The article mentions the publication of DIN 216 in Germany in 1922, but can anyone address the history of the adoption of these standard sizes of papers in the various countries of Europe. It would be particularly interesting to discuss when the UK went over to this metric standard. --SteveMcCluskey (talk) 22:36, 7 May 2009 (UTC)

Also, does anybody know which countries DON'T use it? The only country where I noticed that the paper is weird is the USA. 203.214.115.85 (talk) 16:14, 19 August 2009 (UTC)