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Secondsout dating For the metric unit of second, there are decimal prefixes representing 10 seconds.

Some common units of time in seconds are: an hour is 3600 seconds; a day is 86,400 seconds, a week is 604,800 seconds; a year is about 31.6 million seconds; and a century is a little over 3 billion (3.16) seconds.

Another intuitive understanding is that it is about the time between beats of a human heart.Fractions of a second are usually denoted in decimal notation, i.e. Multiples of seconds are usually expressed as minutes and seconds, or hours, minutes and seconds of clock time, separated by colons, such as , or (the latter notation can give rise to ambiguity, because the same notation is used to denote hours and minutes).It rarely makes sense to express longer periods of time like hours or days in seconds, because they are awkwardly large numbers.This time scale "ticks" the same atomic seconds as TAI, but inserts or omits leap seconds as necessary to correct for variations in the rate of rotation of the earth.A time scale in which the seconds are not exactly equal to atomic seconds is UT1, a form of universal time.Mechanical and electric clocks and watches usually have a face with 60 tickmarks representing seconds and minutes, traversed by a second hand and minute hand.Digital clocks and watches often have a two-digit counter that cycles through seconds.Of the 22 named derived units of the SI, only three: degree Celsius, radian, and steradian, do not depend on the second.Many derivative units for everyday things are reported in terms of larger units of time, not seconds, such as clock time in hours and minutes, velocity of a car in miles/hour or kilometers/hour, kilowatt hours of electricity usage, and speed of a turntable in rotations per minute.Some common events in seconds are: a stone falls about 4.9 meters from rest in one second; a pendulum of length about one meter has a swing of one second, so pendulum clocks have pendulums about a meter long; the fastest human sprinters run 10 meters in a second; an ocean wave in deep water travels about 23 meters in one second; sound travels about 343 meters in one second in air; light takes a fraction over one second to reach Earth from the surface of the Moon.A second is part of other units, such as frequency measured in hertz (inverse seconds or second).

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