Convert Hours to Shakes
Convert Hours (h) to Shakes (sh) instantly and accurately.
Conversion Formula
sh = h × 360000000000
About Hours
An hour (h) = exactly 3,600 s. The 24-hour day traces to ancient Egypt (10 daylight hours + 2 twilight + 12 night star-rise periods). Time zones are integer or half-hour UTC offsets (exceptions: India +5:30, Nepal +5:45). The kilowatt-hour = 3,600,000 J; Tc-99m half-life = 6.0067 h. Drug dosing and pharmacokinetics are expressed in hours. 1 h = 3,600 s = 60 min = 1/24 day.
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
| Hours (h) | Shakes (sh) |
|---|---|
| 1 h | 3.6 × 1011 sh |
| 2 h | 7.2 × 1011 sh |
| 5 h | 1.8 × 1012 sh |
| 10 h | 3.6 × 1012 sh |
| 25 h | 9 × 1012 sh |
| 50 h | 1.8 × 1013 sh |
| 100 h | 3.6 × 1013 sh |