time · International · Modern
SI base unit of time. The caesium-133 hyperfine transition frequency is fixed exactly at 9,192,631,770 Hz.
Converter
time · International · Mixed
shake
shakeinformal
- Record
- M296
- Definition quality
- Informal
- Conversion mode
- multiplicative
- Calculator
- Fully calculable
Origin story/name etymology not yet approved; only value/use verified.
Definition
One shake = 10 nanoseconds = 10^-8 s.
Reference value
One shake is equal to 1.000000 × 10^-8 seconds.
History & use
Informal nuclear-physics/engineering time unit; authoritative U.S. national-lab literature explicitly uses the 10 ns value.
Modern use
Specialized/informal rather than an SI unit.
Did you know?
Its scale is comparable to the time light takes to travel only a few metres.
Sources & evidence
Source tier Tier A · confidence High
Related measurements
minute
mintime · International · Mixed
1 minute = exactly 60 s.
hour
htime · International · Mixed
1 hour = exactly 3600 s.
day
dtime · International · Mixed
1 day = exactly 86,400 s for unit-conversion purposes.
week
wktime · International · Mixed
1 week = 7 days = 604,800 s when used as a fixed duration.
time · International · Mixed
Documented physics usage: light-travel time over 1 cm; other jiffy meanings exist.
approx.informaltime · International · Mixed
Planck time, 2022 CODATA: 5.391247(60)×10^-44 s.
approx.time · International · Mixed
Based on July 21–31, 2017 tenure; Scaramucci himself uses 11 days as the unit.
informal