yoctosecond
/ˈjɑktoʊˌsɛkənd/
noun
- A very tiny unit of time equal to one septillionth (10⁻²⁴) of a second, used in physics to measure extremely fast events.
- A yoctosecond is so short that light travels only a fraction of the width of an atom in that time.
- One yoctosecond is to a second what a second is to about 31.7 trillion years.
- Scientists measure the decay of certain particles in yoctoseconds.