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It is usually represented as a number (numeric value) of units together with the type of those units (if required) and a referent defining the nature of the collection. Both parts are required.
Examples are
A number by itself is not a quantity, nor is a simple measurement. Where the unit count is one then the indefinite article may be used (for example, a car) and similar alternatives exist for other particular counts (for example, a brace of pheasant, a dozen eggs).
Quantification in its very simplest sense can be found in statements such as "A is greater than B". In the example cited, an expression is made that A has a greater quantity of something (such as volume or charisma) than B; and that if A and B were placed in an ordered set, then A would come after B if the order is arranged on an increasing (rather than decreasing) scale.