Second
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| Archivo:FOCS-1.jpg FOCS 1, a continuous cold caesium fountain atomic clock in Switzerland, started operating in 2004 at an uncertainty of one second in 30 million years. |
The second (symbol: s) is the base unit of time in the International System of Units (SI)
- See also: Wikipedia, Wiktionary, Commons
- Related: Becquerel, Coordinated Universal Time, Hertz, International Atomic Time, International System of Units, Leap second, Magneto-optical trap, Time standard
| National Physical Laboratory: Trapped ion optical ... National Physical Laboratory: Trapped ion optical frequency standards www.npl.co.uk/server.php?show=ConWebDoc.1086 - Web |
| High-accuracy strontium ion optical clock; Nationa... High-accuracy strontium ion optical clock; National Physical Laboratory (2005) resource.npl.co.uk/docs/networks/time/meeting3/klein.pdf - Web |
| National Research Council of Canada: Optical frequ... National Research Council of Canada: Optical frequency standard based on a single trapped ion inms-ienm.nrc-cnrc.gc.ca/.../optical_frequency_projects_e.html#optical - Web |
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| NIST: Definition of the second; notice the cesium ... NIST: Definition of the second; notice the cesium atom must be in its ground state at 0 K physics.nist.gov/cuu/Units/second.html - Web |
| Official BIPM definition of the second Official BIPM definition of the second www.bipm.org/en/si/si_brochure/chapter2/2-1/second.html - Web |
| Seconds and leap seconds by the USNO Seconds and leap seconds by the USNO tycho.usno.navy.mil/leapsec.html - Web |
| The leap second: its history and possible future The leap second: its history and possible future www.cl.cam.ac.uk/~mgk25/time/metrologia-leapsecond.pdf - Web |
| What is a Cesium atom clock? What is a Cesium atom clock? inms-ienm.nrc-cnrc.gc.ca/faq_time_e.html#10 - Web |
