Names of units of time

Units of time can vary significantly in duration. Here are some common names of units of time, listed from the shortest to the longest: 1. **Instant** - An infinitesimally small amount of time. 2. **Microsecond** (µs) - One millionth of a second. 3. **Nanosecond** (ns) - One billionth of a second. 4. **Picosecond** (ps) - One trillionth of a second.