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The second (symbol: s) (abbreviated s or sec) is the base unit of time in the International System of Units (SI).
The second (symbol: s) (abbreviated s or sec) is the base unit of time in the International System of Units / SystÃ¨me International d'UnitÃ©s (SI). It is qualitatively defined as the second division of the hour by sixty, the first division by sixty being the minute. The SI definition of second is 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.