# Picosecond

A picosecond is a unit of time equal to one trillionth (10-12) of a second. This is one millionth of one millionth of a second, or 0.000 000 001 seconds. A picosecond is to one second what one second is to about 31.71 million years. How fast does light travel in a picosecond? Light travels at a speed of 299,792 kilometers per second in a vacuum. In a picosecond, light travels 299.792 kilometers.

#### Is a picosecond real?

A picosecond is an extremely short amount of time, and is thus difficult to measure directly. However, there are indirect ways to measure picoseconds which suggest that they are real. For example, measurements of the speed of light suggest that it takes about one picosecond for light to travel the thickness of a human hair. How small is a picosecond? A picosecond is a unit of time equal to 10-12 seconds, or one trillionth (1/1,000,000,000,000) of a second.

### What is the smallest second?

The smallest second is 1/60th of a minute, or 0.016666667 minutes. There are 60 seconds in a minute, so 0.016666667 minutes is 1/60th of a minute. There are 60 minutes in an hour, so 1/60th of a minute is 1/3600th of an hour. There are 24 hours in a day, so 1/3600th of an hour is 1/86400th of a day. There are 365.24 days in a year, so 1/86400th of a day is 1/31,557,600th of a year.

What is the longest unit of time? There is no definitive answer to this question as it depends on the specific system or framework being used. However, in general, the longest unit of time is the "age" or "duration" of the universe, which is estimated to be around 13.8 billion years.