it is the second
A second.
It, as with many other units of measure, is a standard to which everyone can agree.
what does a standard thread gauge measure
A standard of living measure is the economic position of the individual.
Units of measure do follow the standard deviation.
The standard unit of measure for sound is the decibel (dB).
time value analysis
Pulse rate changes, so it is not a reliable measure of a time standard. It is different for different people too.
It depends on what you are trying to measure. There are different standard units for different characteristics.
"Minutes" (a measure of time equal to 60 standard seconds) is pronounced "MIN-itz".
The worldwide standard measures of time - seconds, minutes, hours, days, weeks, months, years, centuries- are used by Buddhists. They measure these by watches, sundials, clocks, and calendars.
Time Value Analysis