1 E-21 s

Encyclopedia : 1 : 1E : 1E2 : 1 E-21 s

To help compare orders of magnitude of different times this page lists times between 10⁻²¹ seconds and 10⁻¹⁸ seconds (1 zeptosecond to 1 attosecond) See also times of other orders of magnitude.

shorter times
about 17 zs – the approximate period of electromagnetic radiation at the boundary between gamma rays and X-rays.
about 300 zs – typical cycle time of X-rays, on the boundary between hard and soft X-rays.
longer times

Orders of magnitude (time), by powers of seconds
Negative powers	10^-44 s \| ... \| 10^-25 s \| 10^-24 s \| 10^-23 s \| 10^-22 s \| 10^-21 s \| 10^-20 s \| 10^-19 s \| 10^-18 s \| 10^-17 s \| 10^-16 s \| 10^-15 s \| 10^-14 s \| 10^-13 s \| 10^-12 s \| 10^-11 s \| 10^-10 s \| 10^-9 s \| 10^-8 s \| 10^-7 s \| 10^-6 s \| 10^-5 s \| 10^-4 s \| 10^-3 s \| 10^-2 s \| 10^-1 s
Positive powers	1 s \| 10 s \| 10² s \| 10³ s \| 10⁴ s \| 10⁵ s \| 10⁶ s \| 10⁷ s \| 10⁸ s \| 10⁹ s \| 10¹⁰ s \| 10¹¹ s \| 10¹² s \| 10¹³ s \|10¹⁴ s \| 10¹⁵ s \| 10¹⁶ s \| 10¹⁷ s \| 10¹⁸ s \| 10¹⁹ s and more

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