Nanoseconds, Time

The second (symbol: s; abbreviation: sec.) is the name of a unit of time, and today refers to the International System of Units (SI) base unit of time. Subdivisions of the second, such as millisecond (one thousandth of a second), and (although encountered less frequently in practice) multiples of the second, such as kilosecond (1,000 seconds), can be indicated by adding SI prefixes to second. Read more >>

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Time has long been a major subject of philosophy, art, poetry, and science. There are widely divergent views about its meaning, hence it is difficult to provide an uncontroversial definition of time. Many fields use an operational definition in which the units of time are defined. Scholars disagree on whether time itself can be measured or is itself part of the measuring system. Read more >>