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- The second (s or sec) is the International System of Units (SI) unit of time measurement. One second is the time that elapses during 9,192,631,770 (or 9.192631770 x 10 9 in decimal form) cycles of the radiation produced by the transition between two levels of the cesium-133 atom.
www.techtarget.com/whatis/definition/second-s-or-sec
The second (symbol: s) is a unit of time, 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). The current and formal definition in the International System of Units (SI) is more precise:
second, fundamental unit of time, now defined in terms of the radiation frequency at which atoms of the element cesium change from one state to another. The second was formerly defined as 1/86,400 of the mean solar day—i.e., the average period of rotation of the Earth on its axis relative to the Sun. In the mid-20th century this definition ...
- Jonathan D. Betts
Jan 18, 2018 · The answer, simply, is that a second is 1/60th of a minute, or 1/3600th of an hour. But that’s just pushing the question down the road a bit. After all, what’s an hour? That answer is related to the best means of time-keeping ancient civilizations had — the movement of the Earth through the heavens.
- Nathaniel Scharping
Jan 26, 2018 · In today’s hyper-connected world, where communications are measured in 1/10 of a nanosecond, accurate atomic clocks keep the world working. In the future, clocks far more accurate than the...
- Rob Waugh
Nov 20, 2023 · There are 24 hours in a day, 60 minutes in an hour, and 60 seconds in a minute — so surely a second is just 1/ (24 x 60 x 60), or 1/86400, of a day, right? Well, it turns out that defining time...
- Victoria Atkinson
The second (s or sec) is the International System of Units (SI) unit of time measurement. One second is the time that elapses during 9,192,631,770 (or 9.192631770 x 10 9 in decimal form) cycles of the radiation produced by the transition between two levels of the cesium-133 atom.
Sep 14, 2024 · The short answer. A "second" in time is called a "second" because it is the second division of an hour. The first division of an hour is the minute, which divides an hour into 60 parts. Seconds are the next division, breaking each minute down into 60 smaller units.
