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File:Kilograms-pml0013 K20 and Friends Four of the five U.S. national prototype kilogram artifacts, including K20 (front) and K4 (back).png

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Captions

K20 and Friends: Four of the five U.S. national prototype kilogram artifacts, including K20 (front) and K4 (back)

Summary edit

Description
English: K20 and Friends: Four of the five U.S. national prototype kilogram artifacts, including K20 (front) and K4 (back) These are carefully calibrating mass standards in metrology.
Date
Source

https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2018/05/14/kilograms-pml0013.png?itok=hOXPUON0

and https://www.nist.gov/si-redefinition/kilogram
Author J. Lee/NIST

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Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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current14:40, 5 May 2022Thumbnail for version as of 14:40, 5 May 20221,400 × 772 (1.21 MB)WalkingRadiance (talk | contribs)Uploaded a work by J. Lee/NIST from https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2018/05/14/kilograms-pml0013.png?itok=hOXPUON0 and https://www.nist.gov/si-redefinition/kilogram with UploadWizard

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