Letter (paper size)
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Letter (officially ANSI A) is a paper size standard defined in ANSI/ASME Y14.1 by the American National Standards Institute, commonly used as home or office stationery primarily in the United States, Canada, and the Philippines, and variably across Latin America.[1] It measures Script error: No such module "convert". and is similar in use to the A4 paper standard at Template:Cvt used by most other countries, defined in ISO 216 by the International Organization for Standardization.
Details
The Reagan administration made Letter-size paper the norm for US federal forms in the early 1980s; previously, the smaller "official" Government Letter size, Script error: No such module "convert". (aspect ratio: 1.3125), was used in government, while Script error: No such module "convert". paper was standard in most other offices.[2] The aspect ratio is Template:Sfrac ≈ 1.294 and the diagonal is
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In the US, paper density is usually measured in "pound per reams" (of 500 sheets). Typical Letter paper has a basis weight of paper of Script error: No such module "convert". – the weight of 500 sheets (a ream) of Script error: No such module "convert". paper at Script error: No such module "convert". and at 50% humidity.[3] One ream of 20-pound Letter-sized paper weighs Script error: No such module "convert"., and a single Letter-sized sheet of 20-pound paper weighs Script error: No such module "convert"., which is equivalent to 75.19 g/m2. Some metric information is typically included on American ream packaging. For example, 20-pound paper is also labeled as 75 g/m2. The most common density of A4 paper is 80 g/m2.
The related paper size known as Invoice (colloquially Half Letter) is exactly one half of the US Letter size: Script error: No such module "convert"..
History
The precise origins of the dimensions of US letter-size paper (8.5 × 11 in) are not known. The American Forest & Paper Association says that the standard US dimensions have their origin in the days of manual papermaking, the 11-inch length of the standard paper being about a quarter of "the average maximum stretch of an experienced vatman's arms".[2] The letter size falls within the range of the historical quarto size, which since pre-modern times refers to page sizes of Script error: No such module "convert". wide and Script error: No such module "convert". high, and it is indeed almost exactly one quarter of the old Imperial (British) paper size known as demy quarto – Script error: No such module "convert". – allowing a Script error: No such module "convert". for trimming.[4]
See also
References
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- ↑ "US Letter" is the primary paper size used in Belize, Canada, Chile, Colombia, Costa Rica, El Salvador, Guatemala, Mexico, Nicaragua, Panama, Philippines, Puerto Rico, United States, Venezuela according to Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Blocksma, Mary. Reading the Numbers. New York: Penguin Books, 1989.
- ↑ Script error: No such module "citation/CS1".
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