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Define second....

Define second.

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**Step-by-Step Solution:** 1. **Definition of Second**: The second, denoted as 's', is the base unit of time in the International System of Units (SI). 2. **Relation to a Day**: Mathematically, one second is defined as 1/86,400 of a day. This means that there are 86,400 seconds in a single day. 3. **Smallest Unit of Time**: In everyday life, the second is considered the smallest unit of time commonly used. For example, in watches, the second is the smallest increment of time displayed. ...
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