Quantity
Quantity is a generic term used when referring to the measurement (count, amount) of a scalar, vector, number of items or to some other way of denominating the value of a collection or group of items.
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
- one apple, two apples, three apples, where the number is an integer so does not require a type
- 1.76 litres (liters) of milk
- 500 people
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 (eg. a car) and similar alternatives exist for other particular counts (eg. a brace of pheasant, a dozen eggs)
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