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PerliteUSGOV.jpg (486 × 418 mynddílar, skráarstærð: 46 KB, MIME-gerð: image/jpeg )
Skrá þessi er af Wikimedia Commons, og deilt meðal annarra verkefna og nýtist því þar.
Hér fyrir neðan er afrit af skráarsíðunni þar .
Description: Perlite (volcanic glass with white powder appearance). Perlite is a volcanic glass that has many industrial applications, because of its light density and insulating properties.
Source: USGSS (dead link; Archived )
Transferred from the English language wikipedia Johan Lont at 11:53, 1 Feb 2005 (UTC). Original upload by w:en:User:Chris 73 .
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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Public domain Public domain false false
This image is a work of the "Minerals in Your World" project, a cooperative effort between the United States Geological Survey and the Mineral Information Institute . The images were featured in the "Minerals and Materials Photo Gallery" on the website of the U.S House Subcommittee on Energy and Natural Resources. As a work of the U.S. federal government , the image is in the public domain in the United States.
íslenska Add a one-line explanation of what this file represents
enska Photograph of pieces of perlite beside an American penny to indicate scale.
Breytingaskrá skjals
Smelltu á dagsetningu eða tímasetningu til að sjá hvernig hún leit þá út.
Dagsetning/Tími Smámynd Víddir Notandi Athugasemd
núverandi 7. maí 2011 kl. 11:57 486 × 418 (46 KB) Materialscientist crop whitespace (plate is not the object)
1. febrúar 2005 kl. 11:46 600 × 449 (45 KB) Johan Lont Perlite (volcanic glass)
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