Question
Name the S.I unit of time and define it.
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Answer
The S.I. unit of time is second (s).
A second is defined as 1/86400th part of a mean solar day, i.e.
$1 s =\frac{1}{86400} \times$ one mean solar day
A second is defined as 1/86400th part of a mean solar day, i.e.
$1 s =\frac{1}{86400} \times$ one mean solar day
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