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Redefining Time.

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Title: Redefining Time.
Authors: BENNETT, JAY (AUTHOR)
Source: Scientific American. Mar2025, Vol. 332 Issue 3, p56-65. 10p. 7 Color Photographs, 7 Diagrams.
Subjects: General relativity (Physics), Atomic clocks, Metric system, Quantum theory, Crystal oscillators
Abstract: The article discusses the advancements in atomic clocks, particularly the transition from cesium clocks to optical clocks that use atoms like strontium or ytterbium. These optical clocks are more accurate than cesium clocks, leading to discussions about redefining the second. The International Bureau of Weights and Standards has set criteria for redefining the second, but some scientists are hesitant due to the lack of immediate benefits. The article also delves into the history of timekeeping, from sundials to atomic clocks, highlighting the evolution of time measurement. [Extracted from the article]
Copyright of Scientific American is the property of Scientific American and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: <searchLink fieldCode="AR" term="%22BENNETT%2C+JAY%22">BENNETT, JAY</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Scientific+American%22">Scientific American</searchLink>. Mar2025, Vol. 332 Issue 3, p56-65. 10p. 7 Color Photographs, 7 Diagrams.
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  Data: The article discusses the advancements in atomic clocks, particularly the transition from cesium clocks to optical clocks that use atoms like strontium or ytterbium. These optical clocks are more accurate than cesium clocks, leading to discussions about redefining the second. The International Bureau of Weights and Standards has set criteria for redefining the second, but some scientists are hesitant due to the lack of immediate benefits. The article also delves into the history of timekeeping, from sundials to atomic clocks, highlighting the evolution of time measurement. [Extracted from the article]
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  Data: <i>Copyright of Scientific American is the property of Scientific American and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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              Text: Mar2025
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