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Source - Second
Second (s) - Definition and Overview
What is Second?
The second(sec,s) is the base unit of time in the International System of Units (SI). It is defined as 1/86400 of a day. Multiples of seconds are usually counted in minutes and hours.
Summary
- The second is the fundamental unit of time in the International System of Units (SI)
- It is defined based on the vibrations of cesium atoms
- One second is the duration of 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom.
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