How long is a seconds?

Answer 1

There are two possible measurements for "second":

A duration of time

• A second (1/60 of a minute) was originally defined as 1/86 400 of the mean solar day. However this could not be accurately measured. Presently the second is the duration of 9 192631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom

The distance around the circumference of a curve:

• A curve is divided into 360 degrees, each degree contains 60 minutes and each minute 60 seconds. So each second is 1/1,296,000 of the circumference.

Answer 2

Seconds is one of many units of time. However, it is the official SI unit of time.

Answer 3

1000 milliseconds