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ERIC Number: EJ984083
Record Type: Journal
Publication Date: 2012-Sep
Pages: 5
Abstractor: As Provided
Reference Count: 13
ISSN: ISSN-0031-921X
Changes Coming to the International System of Units
Aubrecht, Gordon J., II
Physics Teacher, v50 n6 p338-342 Sep 2012
The International System of Units (SI) is a coherent system based originally on measurements of properties of material objects. In more recent times, the adopted definitions depend on setting values of universal constants wherever possible. The last remaining human-made material object on which a standard is based is a platinum-iridium kilogram located in Sevres, France. The International Bureau of Weights and Measures is considering replacing this physical object as the standard and tying all base units to physical constants that are fixed. The reasons will be explicated in this paper. (Contains 1 figure.)
American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A