Second
From Sciencemadness Wiki
Revision as of 20:19, 23 October 2022 by Mabus (Talk | contribs) (Created page with "{{Stub}} The '''second''' (symbol: '''s''') is the unit of time in the International System of Units (SI), historically defined as {{frac|1|86400}} of a day – this factor d...")
 |
This article is a stub. Please help Sciencemadness Wiki by expanding it, adding pictures, and improving existing text.
|
The second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as 1⁄86400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400).
Currently, the second is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. To allow for the relativistic affects of gravitational time dilation at different altitudes, the second measured for any atomic clock is also corrected to mean sea level.
