Unit of Time

Time is an interesting concept and we all are very familiar with it and know about it. However, the measurement of time requires some specification of units. There are several different units of time and they are used accordingly mostly based on certain circumstances.

What Is Time?

Time is defined as the continued progess of existence in the past, present and future. Using unit of time one can measure the existence of events. Following are the most commonly used units of time:

  • Second
  • Minute
  • Hour

SI Unit of Time

The SI unit of time is the second, which has been further accurately defined as “the time interval equal to 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom (13th CGPM, 1967).” In any case, the unit second is often represented as s or sec.

Popular Time Units

Some of the common and widely used units include minute, hour, day, week, month and year. If we are considering long durations of time, multiples of years are also used to mark a certain time frame. It can be, a decade which is equal to 10 years, a century which is equal to 100 years, a millennium which equals to 1,000 years, and mega-annum which is about 1,000,000 years.

Units of Time
minute 60 seconds
hour 60 minutes, or 3,600 seconds
day 24 hours, or 86,400 seconds
week 7 days, or 604,800 seconds
month 28-31 days, or 2,419,200-2,678.400 seconds
year 365.25 days, or about 31,557,600 seconds

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