The SI unit of electric charge is the Coulomb.
The unit of measurement for the quantity of an electrical charge is called an electrometer. The quantity of charge can also be measured in directly by a ballistic galvanmotere.
A standard use for a measurement of a physical quantity is called the unit of that physical quantity
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.
Unit
Kilograms are the SI unit for mass. Mass is the amount of matter an object has.
A standard unit of measurement is the unit (size or quantity) that is agreed upon in that nation or trading partnership. In science the standard units of measurement are called SI units. (An international standard). This is the metric system.
nozianhashdip
"Ounce" is a unit of weight, and can't be used to express a quantity of mass.
unit of intensity of sound is bels... as it is a bigger quantity in practice we use decibels .. . .
The amount or size of physical quantity depends on two things " number and unit". Every physical quantity has its own standard for fixed amount which is called as unit. The same physical quantity with larger or smaller size is measured in different units. for example 1cm or 1m Therefore even if we have to measure same physical quantity with larger or smaller size of it we should have a standard for comparison.
In the SI standard for physics units (see NIST website,) quantities of electricity are measured in coulombs, same as the quantity of electric charge.
The difference between quantity and unit in "16 pounds" is the unit is pounds and the quantity is 16.