It depends on what you are trying to measure. There are different standard units for different characteristics.
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.
Hertz.
Standard International unit (SI unit)
Ounces or Grams
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.
A second.
grams
Hertz.
The standard unit of measure for length in the metric system, known as the "ku," is the meter.
Standard International unit (SI unit)
degrees, minutes and seconds. (and radians are also a standard unit of angular measure).
A unit of measure is an officially standard used to make measurements.
There is not a standard SI unit to measure sphericity.