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The kilosecond (ks) is a unit of time in the International System of Units, defined as 10 3 seconds using the SI prefix system. SI units of time longer than a second, including kiloseconds, are rarely used because the traditional units of time, such as minutes, hours, and days are still widely used worldwide.

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.

Horizontal logarithmic scale marked with units of time. A millisecond (from milli-and second; symbol: ms) is a thousandth (0.001 or 10 −3 or 1 / 1000) of a second.. A unit of 10 milliseconds may be called a centisecond, and one of 100 milliseconds a decisecond, but these names are rarely used.

An attosecond is 1×10 −18 of a second (one quintillionth of a second). For context, an attosecond is to a second what a second is to about 31.71 billion years. The word "attosecond" is formed by the prefix atto and the unit second.

An attosecond (as) is a very short period of time. It is equal to one quintillionth of a second (or 0.000000000000000001 seconds). It can also be written as 10 −18 seconds. ...

A picosecond is an SI unit of time equal to 10 −12 or 1 ⁄ 1 000 000 000 000 (one trillionth) of a second.That is one trillionth, or one millionth of one millionth of a second, or 0.000 000 000 001 seconds.