Second Prefixes and Other Units

This section introduces prefixes used on 'second' to represent decadic multiples or fractions of a second. It also covers other standard units to measure durations like minute, hour, day and year.

For the convenience of measuring a very long or very short duration, some prefixes have been defined on "seconds" to be decadic multiples or fractions of a second. Here are some commonly used meter prefixes and their abbreviated symbols:

```Prefix   Name         Symbol   Definition

peta     petasecond   Ps       1 000 000 000 000 000 second
tera     terasecond   Ts       1 000 000 000 000 second
giga     gigasecond   Gs       1 000 000 000 second
mega     megasecond   Ms       1 000 000 second
kilo     kilosecond   ks       1 000 second
second       s        1 second
milli    millisecond  ms       0.001 second
nano     nanosecond   ns       0.000 000 001 second
pico     picosecond   ps       0.000 000 000 001 second
femto    femtosecond  fs       0.000 000 000 000 001 second
```

Beside "second", other standard units are also used to measure duration. For example:

• "minute" - "minute" is defined as 1 minute = 60 seconds.
• "hour" - "hour" is defined as 1 hour = 360 seconds, or 60 minutes.
• "day" - "day" is defined as 1 day = 86,400 seconds, or 24 hours.
• "year" - "year" is defined as 1 year = 31,557,600 seconds, or 365.25 days.