time · International · Modern
SI base unit of time. The caesium-133 hyperfine transition frequency is fixed exactly at 9,192,631,770 Hz.
time · International · Mixed
Some sources count 10; display convention note.
Source tier Tier B/C — recorded secondary/reference source · confidence High
time · International · Modern
SI base unit of time. The caesium-133 hyperfine transition frequency is fixed exactly at 9,192,631,770 Hz.
time · International · Mixed
1 minute = exactly 60 s.
time · International · Mixed
1 hour = exactly 3600 s.
time · International · Mixed
1 day = exactly 86,400 s for unit-conversion purposes.
time · International · Mixed
1 week = 7 days = 604,800 s when used as a fixed duration.
time · 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.