Súbor:TungstenMetalUSGOV.jpg

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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

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English: Tungsten green-silver metal powder. Originaly from Minerals and Materials Photo Gallery.

Slovenščina: Volfram v zeleno-srebrnem prahu. Izvirno s strani Minerals and Materials Photo Gallery.

Uploaded to English Wikipedia by Chris 73.

Tento soubor je volné dílo, protože obsahuje materiály pocházející od United States Geological Survey (USGS), agentury Ministerstva vnitra USA. Pro bližší informaci vizte oficiální licenční pravidla USGS (anglicky).

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