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seconden

Seconden is the plural form of the Dutch noun seconde, the unit of time in the International System of Units (SI). In Dutch, durations are commonly expressed in seconden, for example drie seconden. The symbol for the second is s, and it is the base unit for measuring time in science, technology, and everyday life.

Definition and standards. The second is the base unit of time in the SI system. Historically defined

Usage and conversions. Seconds are used to express durations, time stamps, and rates. Common conversions include

Other contexts. In angular measurement, an arcsecond is a unit equal to 1/3,600 of a degree, and

as
1/60
of
a
minute
and
1/3600
of
an
hour,
it
is
currently
realized
through
atomic
processes.
The
conventional
practical
definition
ties
the
second
to
the
radiation
corresponding
to
the
transition
between
two
hyperfine
levels
of
the
ground
state
of
the
cesium-133
atom,
amounting
to
9,192,631,770
periods
of
that
radiation.
Since
the
2019
redefinition
of
SI
units,
the
second
is
defined
by
fixing
the
numerical
value
of
the
Planck
constant
h
to
exactly
6.62607015×10^-34
J
s,
with
the
second
realized
in
practice
by
atomic
clocks.
1
minute
=
60
seconds,
1
hour
=
3,600
seconds,
and
1
day
=
86,400
seconds.
Submultiples
such
as
milliseconds
(1/1,000
s),
microseconds
(1/1,000,000
s),
and
nanoseconds
(1/1,000,000,000
s)
are
widely
used
in
science
and
technology.
in
Dutch
it
is
often
called
boogseconde.
The
term
seconden
thus
appears
in
both
temporal
and
related
measurement
contexts,
reflecting
the
historical
prominence
of
the
second
as
a
fundamental
unit
of
measurement.