26 Sep '11, 12am

Ref. paper weight, found this and I'm now really confused.

Paper in the U.S. is 8.5 x 11 inches, or 215 x 280 mm, with an area of 0.06 m2 . An "A4" sheet is 210 x 297 mm and so is 0.06 m2 . "Standard" U.S. office paper is 20 lb. weight; each sheet is 8.5 x 11 inches and covers about 0.65 ft2 . There are about 200,000 such sheets in a ton. There are 100 to a pound and about 6 per ounce. A ream of such paper is 500 sheets, so there are 400 reams per ton, and each ream weighs 5 lbs. Paper prices vary, but a typical bulk cost is $1,000/ton, which is $2.50 per ream of 500 sheets, half a cent per sheet, 50 cents per pound, or 3 cents per ounce. A ream of unused paper is about 2 inches thick, so there are 250 sheets per inch, 3,000 sheets per foot, and each sheet is 0.004 inches thick. Outside of the U.S., paper is usually measured by metric and ISO (International Standards Organization) measures, such as "A4" paper. Paper for InkJet pri...

Full article: http://eetd.lbl.gov/paper/ideas/html/copyfactsA.htm

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