Convert Zeptoseconds to Seconds
Convert Zeptoseconds (zs) to Seconds (s) instantly and accurately.
Conversion Formula
s = zs × 1.000000000e-21
About Zeptoseconds
A zeptosecond (zs) = 10⁻²¹ s. In 2020, physicists at Goethe University Frankfurt measured the H₂ photoionisation time at ~247 zs - the first direct event measurement at this timescale. W-boson lifetime ~300 zs; strong-force quark confinement dynamics ~1-3 zs. These timescales are resolved via the energy-time uncertainty relation and lattice-QCD simulations. 1 zs = 10⁻²¹ s = 1,000 ys.
About Seconds
The second (s) is the SI base unit of time, defined since 1967 as exactly 9,192,631,770 periods of the caesium-133 ground-state hyperfine transition at 0 K. Caesium fountain clocks realise this to ~10⁻¹⁶ (1 s lost per ~300 million years); optical lattice clocks (Sr, Yb) reach ~10⁻¹⁸. The second links to the metre via the defined speed of light c = 299,792,458 m/s exactly. 1 s = 1,000 ms = 1/60 min.
Quick Reference Table
| Zeptoseconds (zs) | Seconds (s) |
|---|---|
| 1 zs | 1 × 10-21 s |
| 2 zs | 2 × 10-21 s |
| 5 zs | 5 × 10-21 s |
| 10 zs | 1 × 10-20 s |
| 25 zs | 2.5 × 10-20 s |
| 50 zs | 5 × 10-20 s |
| 100 zs | 1 × 10-19 s |