Convert Zeptoseconds to Shakes
Convert Zeptoseconds (zs) to Shakes (sh) instantly and accurately.
Conversion Formula
sh = zs × 1.000000000e-13
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 Shakes
A shake = exactly 10 ns (10⁻⁸ s) - the informal unit for fission prompt-neutron generation time, coined at Los Alamos during the Manhattan Project (1943-1945). A prompt-neutron generation in a supercritical core takes ~1-10 shakes; a full explosive chain reaction unfolds over ~50-100 shakes. The name alludes to 'two shakes of a lamb's tail'. Still used in reactor physics and weapons-design calculations. 1 shake = 10 ns.
Quick Reference Table
| Zeptoseconds (zs) | Shakes (sh) |
|---|---|
| 1 zs | 1 × 10-13 sh |
| 2 zs | 2 × 10-13 sh |
| 5 zs | 5 × 10-13 sh |
| 10 zs | 1 × 10-12 sh |
| 25 zs | 2.5 × 10-12 sh |
| 50 zs | 5 × 10-12 sh |
| 100 zs | 1 × 10-11 sh |