zeptosecond
/ˈzɛptəˌsɛkənd/
noun
- A unit of time equal to one sextillionth of a second (10⁻²¹ seconds), used in physics to measure extremely fast processes.
- A zeptosecond is so short that light travels only the width of a hydrogen atom in that time.
- The experiment recorded events lasting just a few zeptoseconds.
- Scientists measured the movement of particles within a zeptosecond.