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
Light-centimetre jiffy
informal
Variant of jiffy (physics usage)
- Record
- M534
- Definition quality
- Informal scientific convention
- Conversion mode
- multiplicative
- Calculator
- Fully calculable
Definition
One Light-centimetre jiffy is approximately 3.335641 × 10⁻¹¹ seconds.
Approximate reference value
One Light-centimetre jiffy is understood to be about 3.335641 × 10⁻¹¹ seconds.
Modern use
Modern use is context-dependent and varies by region or measurement system.
Did you know?
This named variant removes the biggest 'jiffy' ambiguity: it means specifically the time light needs to cross 1 cm—about 33.36 picoseconds—not a computer clock tick or mains cycle.
Sources & evidence
Source tier Tier B/C — recorded secondary/reference source · confidence Moderate
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.
shake
shaketime · International · Mixed
One shake = 10 nanoseconds = 10^-8 s.
informaltime · 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.