Seconds is the basic unit of time in the international system of units, with the symbol S, sometimes marked with English abbreviations as sec.

1s = 10 3 ms (milliseconds) = 10 6 μ s (microseconds) = 10 9 ns (nanoseconds) =10/2ps (picoseconds) = 65438.

brief introduction

The prefix of the international system of units is often combined with seconds to make a finer division, such as ms (millisecond, thousandth of a second), μs (microsecond, millionth of a second) and ns (nanosecond, billionth of a second).

Although the international unit prefix system can also be used to extend time, such as Ks (thousands of seconds), Ms (millions of seconds) and Gs (billions of seconds), it is rarely used in this way, and people are still used to using 60-decimal minutes, hours and 24-decimal days as the extension of seconds.