A metal cylinder used for setting the international standard of the kilogram has been slowly gaining mass over the years. This article describes the impact of that mass gain and what scientists are doing to shrink it back to size.

Concepts

mass

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Additional Tags

standards of measurement, scholastic, kilogram, metric system

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Classroom Considerations

• Knovation Readability Score: 3 (1 low difficulty, 5 high difficulty)

• This resource is only available on an unencrypted HTTP website.It should be fine for general use, but don’t use it to share any personally identifiable information

Common Core

3.MD.A.2