Checked content

File:Watt balance, large view.jpg

Watt_balance,_large_view.jpg ‎(550 × 474 pixels, file size: 287 KB, MIME type: image/jpeg)
Description
English: The Watt balance at the US National Institute of Standards and Technology (NIST). This is an experimental, extremely accurate mass measuring instrument. The vacuum chamber dome, above the apparatus, descends during use so it operates in vacuum. The Watt balance measures mass by comparing it to atomic units, Planck's constant and the speed of light. It is being developed to provide a more accurate standard of mass than the current one. Currently the primary standard defining all the world's mass and weight units is the International Prototype Kilogram (IPK), a cylinder of platinum-iridium alloy kept in a vault at Sevres, France. It is the only unit defined by a physical artifact, so it is vulnerable to damage and deterioration over the years, and in fact has been found to vary in mass. When it is perfected, the Watt balance will be used to "weigh" the IPK, defining the kilogram by atomic units so a physical prototype will not be needed, creating an "electronically" defined kilogram.
Date 2007-10-17 (first version); 2007-10-18 (last version)
Source Transferred from en.wikipedia; transferred to Commons by User:Mormegil using CommonsHelper.
Author Photo by Richard Steiner (Original uploader was Greg L at en.wikipedia)
Permission
( Reusing this file)

Licensed under the GFDL by the author; GFDL-SELF-NO-DISCLAIMERS; Released under the GNU Free Documentation License.

OTRS Wikimedia

 The permission to use this work has been archived in the Wikimedia OTRS system. It is available here for users with an OTRS account. If you wish to reuse this work elsewhere, please read the instructions at COM:REUSE. If you are a Commons user and wish to confirm the permission, please leave a note at the OTRS noticeboard.

Ticket link: https://secure.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom&TicketID=1146294&ArticleID=1403912&QueueID=27

Licensing

GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

w:en:Creative Commons
attribution share alike		 This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
  • share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.
This licensing tag was added to this file as part of the GFDL licensing update.
The following pages on Schools Wikipedia link to this image (list may be incomplete):

Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.
Orientation Normal
Horizontal resolution 72 dpi
Vertical resolution 72 dpi
Software used Adobe Photoshop 7.0
File change date and time 17:37, 17 October 2007
Colour space sRGB

Learn more

Learning is fun and easy with Schools Wikipedia. SOS Childrens Villages believes that a decent childhood is essential to a happy, healthy. Our community work brings families new opportunities through education, healthcare and all manner of support. Sponsoring a child is the coolest way to help.