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Snippet from Wikipedia: Nanosecond

A nanosecond (ns) is a unit of time in the International System of Units (SI) equal to one billionth of a second, that is, ⁠1/1000000000⁠ of a second, or 10⁻⁹ seconds.

The term combines the SI prefix nano- indicating a 1 billionth submultiple of an SI unit (e.g. nanogram, nanometre, etc.) and second, the primary unit of time in the SI.

A nanosecond is to one second, as one second is to approximately 31.69 years.

A nanosecond is equal to 1000 picoseconds or ⁠1/1000⁠ microsecond. Time units ranging between 10⁻⁸ and 10⁻⁷ seconds are typically expressed as tens or hundreds of nanoseconds.

Time units of this granularity are commonly found in telecommunications, pulsed lasers, and related aspects of electronics.

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