Axis

Time & duration

seconds

The SI base unit of time.

Dimension
time
Canonical signature
T
System
si
Exactness
Exact

Definition record

How this unit is defined

Canonical base
1 s = 1 s
Conversion type
linear
Historical notes
Defined from the caesium-133 hyperfine transition frequency (SI 2019).
Aliases
sec, seconds, secs

Same dimension

Related units

minutesi acceptedminhoursi acceptedhdaysi accepteddyear (Julian)astronomicalyrweeksi acceptedwkquettasecondsiQsronnasecondsiRsyottasecondsiYs

Common conversions

Every conversion routes through the canonical base of the dimension.

1 s = 1 s

Exact relationship

10 s = 10 s

Exact relationship