Second

The title of this article is ambiguous. For further meanings see .
Unit
Standard SI fundamental unit
Name Second
Size
s (in former times also: second.)
t
Designated after pars minuta secunda
10 seconds

Those Second (shortens of pars minuta secunda "decreases the veminderten part (again) following" = sequi) is those SI fundamental unit that .

In the SI system of units the second is by an atomic Time-normally defined, since this ensures a substantially larger accuracy and a long-term Konstanz than time-normal how Sunning customer or Ephemeridensekunde.

Table of contents

Current definition

One second is by definition 9.192.631.770-fache of the period of a microwave, those with a selected niveauuebergang in in resonance is. Differently said: 9.192.631.770-fache of the period duration that the transition between the two imported.

Size examples

Millisecond

One Millisecond describes the thousandth part of one second. The millisecond with ms is shortened.

1 ms = 1/1.000 s = 1 · 10-3 s

In 1 ms the light puts a distance back of 299,792 km. Oscillations with 1 ms period duration have a frequency of 1 kHz.

Microsecond

One Microsecond describes the millionsten part of one second. Is shortened the microsecond with µs.

1 µs = 1/1.000.000 s = 1 · 10-6 s

In 1 µs the light puts a distance back of 299,79 m. Oscillations with 1 µs period duration have a frequency of 1 MHz.

Nanosecond

One Nanosecond describes the billionth part of one second. The nanosecond with LV is shortened.

1 LV = 1/1.000.000.000 s = 1 · 10-9 s

In 1 LV the light puts a distance back of 0,3 m. Oscillations with 1 LV period duration have a frequency of 1 GHz.

Picosecond

One Picosecond (also Pikosecond) describes the billionsten part of one second. The picosecond with HP is shortened.

1 HP = 1/1.000.000.000.000 s = 1 · 10-12 s

In 1 HP the light puts a distance back of 0.3 mm. Oscillations with 1 HP of period duration have a frequency of 1 THz.

Femtosekunde

One Femtosekunde describes billiardstel the part of one second. The Femtosekunde with telex is shortened.

1 telex = 1/1.000.000.000.000.000 s = 1 · 10-15 s

In 1 telex the light puts a distance back of 0,3?m. Oscillations with 1 telex period duration have a frequency of 1 PHz (Petahertz). Those Period duration of visible about 1.30 to 2.57 amount to telex.

See also:

Wikipedia on the left of to the group of topics calendar and time


In the German linguistic area used is that .
That the form specifies, in that and to be represented.
Second Millisecond
The structuring that calls itself and/or. Chronology.
Decades of 1290 until today every year of 400 until today all days of a yearly
With the temporal development of the universe those concerns itself .
Those becomes by those into those partitions.
Within that those examines the organisms and their life circumstances.
To humans see:



Web on the left of


- word origin, synonyms and translations


SI fundamental unit

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