SI - Measuring Time
Measuring intervals of time is somewhat unusual compared to working with distance and length. Fractions of seconds are typically measured using the standard prefixes associated with the (decimal) metric system.
Fractions of Seconds: | ||||
---|---|---|---|---|
Prefix | Abbrev. | Decimal Form | Exponent | |
seconds | s. | 1. | 10^{0} | |
milliseconds | ms. | .001 | 10^{-3} | |
microseconds | µs. | .0000001 | 10^{-6} | |
nanoseconds | ns. | .000000001 | 10^{-9} | |
picoseconds | ps. | .000000000001 | 10^{-12} |
Whereas fractions of seconds adhere to the standards laid out within the metric system, multiples of seconds are often measured in terms of minutes and hours.
Multiples of Seconds: | ||||
---|---|---|---|---|
Prefix | Abbrev. | # Seconds | Exponent | |
seconds | s. | 1 sec. | 60^{0} | |
minutes | min. | 60 secs. | 60^{1} | |
hours | hrs. | 3600 secs. | 60^{2} |
The system of hours:minutes:seconds is a carryover from a much older system and represents a departure from the decimal notation used within the metric system.