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This image has currency in it to indicate scale. Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are copyrighted. Ideally, a photograph should include a ruler with the subject (example) or an added scale marking. SI ("metric") units are the most commonly used worldwide (see meter and centimeter). Images with coins to indicate scale Common coin diameters for reference: U.S. dollar (as of?): 1¢: 19.05 mm, 0.75 in 5¢: 21.21 mm, 0.84 in 10¢: 17.91 mm, 0.71 in 25¢: 24.26 mm, 0.94 in 50¢: 30.61 mm, 1.22 in $1: 26.5 mm, 1.02 in Canadian dollar (as of?): 1¢: 19.05 mm, 0.75 in 5¢: 21.2 mm, 0.83 in 10¢: 18.03 mm, 0.71 in 25¢: 23.88 mm, 0.94 in 50¢: 27.13 mm, 1.07 in $1: 26.5 mm, 1.02 in $2: 28 mm, 1.1 in Pound sterling as of 2021: 1p: 20.32 mm, 0.8 in 2p: 25.91 mm, 1.02 in 5p: 18 mm, 0.71 in 10p: 24.5 mm, 0.96 in 20p: 21.4 mm, 0.84 in 50p: 27.3 mm, 1.07 in £1: 23.03–23.43 mm, 0.91–0.92 in £2: 28.4 mm, 1.12 in Euro as of 2002: 1c: 16.25 mm, 0.64 in 2c: 18.75 mm, 0.74 in 5c: 21.25 mm, 0.84 in 10c: 19.75 mm, 0.78 in 20c: 22.25 mm, 0.88 in 50c: 24.25 mm, 0.95 in €1: 23.25 mm, 0.92 in €2: 25.75 mm, 1.01 in Deutsch ∙ English ∙ español ∙ français ∙ Gaeilge ∙ italiano ∙ Plattdüütsch ∙ português ∙ sicilianu ∙ svenska ∙ suomi ∙ македонски ∙ русский ∙ മലയാളം ∙ 한국어 ∙ 日本語 ∙ 中文 ∙ 中文（简体）‎ ∙ עברית ∙ +/−

Summary

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• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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File history

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	08:33, 12 December 2014		1,024 × 768 (140 KB)	Acar54	User created page with UploadWizard

File usage

The following 2 pages use this file:

• Chert
• Limestone