A second.
The standard unit of measure for sound is the decibel (dB).
is meant by measurement in che mistry
The standard unit of measure for length in the metric system is the meter.
To measure a physical quantity correctly and need to compare it with some standard quantities. Thus a standard unit is needed to measure a quantity correctly.
The standard unit to measure mass is kilograms.
It depends on what you are trying to measure. There are different standard units for different characteristics.
Hertz.
grams
The standard unit of measure for length in the metric system, known as the "ku," is the meter.
Standard International unit (SI unit)
The standard metric unit of time is a second (s).
A unit of measure is an officially standard used to make measurements.