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In scientific work, small fractions of a second are counted in milliseconds (thousandths), microseconds (millionths), nanoseconds (billionths), and sometimes smaller units of a second.

To convert a nanosecond measurement to a second measurement, divide the time by the conversion ratio. The time in seconds is equal to the nanoseconds divided by 1,000,000,000.

A nanosecond (ns) is an SI unit of time equal to one billionth of a second, that is, 1⁄1 000 000 000 of a second, or 10⁻⁹ seconds. The term combines the prefix nano- with the basic unit for one-sixtieth of a minute.

(This definition follows U.S. usage in which a billion is a thousand million and a trillion is a 1 followed by 12 zeros.) A nanosecond (ns or nsec) is one billionth (10^-9) of a second and is a common measurement of read or write access time to random access memory (RAM).

A nanosecond is one billionth of a second. One nanosecond is to one second as one second is to 31.7 years.Dec 11, 2012

A femtosecond is the SI unit of time equal to 10^-15 or 1⁄1 000 000 000 000 000 of a second; that is, one quadrillionth, or one millionth of one billionth, of a second.

The centisecond (cs) is a unit of time in the International System of Units, defined as 10⁻² second using the SI prefix system. wins the Daytona 500 by one centisecond, which is the narrowest margin of victory in the race's history.

Milliseconds: A millisecond (ms) is one one-thousandth of a second. To put this in context, the speed of a human eye blink is 100 to 400 milliseconds, or between a 10th and half of a second. Network performance is often measured in milliseconds.Aug 28, 2017

A microsecond is an SI unit of time equal to one millionth (0.000001 or 10⁻⁶ or 1⁄1,000,000) of a second. Its symbol is μs, sometimes simplified to us when Unicode is not available. A microsecond is equal to 1000 nanoseconds or 1⁄1,000 of a millisecond.