Answer:
The International System of Units' (SI's) fundamental unit of time is the second (symbol: s). It is described as the length of 9,192,631,770 radiation periods that correspond to the change from one hyperfine level to another in the cesium-133 atom's ground state. This definition, which was developed in 1967, is very exact.
A second is a very short period of time that is frequently used to measure commonplace events and activities. For instance:
- There are 60 seconds in a minute.
- There are 60 minutes in an hour, so there are 3,600 seconds in an hour.
- There are 86,400 seconds in a day (24 hours).
Seconds are a fundamental unit of time, and they are used in various scientific, engineering, and everyday contexts for measuring and expressing time intervals.