# Name the S.I Unit of Time and Define It. - Physics

Name the S.I unit of time and define it.

#### Solution

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 = 1/86400 x one mean solar day

Concept: International System of Units
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#### APPEARS IN

Selina Concise Physics Class 9 ICSE
Chapter 1 Measurements and Experimentation
Exercise 1 (A) | Q 19 | Page 9