It is defined by taking the fixed numerical value of the caesium frequency Cs, the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s–1. It is determined using radiation periods for the cesium 133 atom.

The International System of Units (SI) identifies "second" as the base unit for time. The base unit of time in the International System of Units (SI) and by extension most of the Western world , is the second , defined as about 9 billion oscillations of the caesium atom. The international unit of length is the meter, and mass is universally measured in kilograms.

The seven SI base units, which are comprised of: Length - meter (m) Time - second (s) Amount of substance - mole (mole)

The measurement of time requires the specification of units, but there are many different units of time, some of which may be more appropriate in certain circumstances than others. Is the Coronavirus Crisis Increasing America's Drug Overdoses?

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In 1967 a new SI definition of a second was created based on the radiation from the caesium-133 atom. A unit of time or midst unit is any particular time interval, used as a standard way of measuring or expressing duration.

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The second, symbol s, is the SI unit of time.

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