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English Club : Learn English : Vocabulary   The noun "quantity"
can be both countable and uncountable.   Meaning: the amount of
something Example sentence: Economists mention both quality and
quantity when they talk about the cost of production.   Meaning:
a particular amount of something or number of things Example
sentence: The police raided several homes and found various
quantities of illegal drugs.  Note: (for advanced students) When
used as an uncountable noun, "quantity" usually refers to an
abstract concept, esp. in economics or engineering, but when
used as a countable noun, it usually refers to a particular
amount of a concrete substance, or a particular number of
concrete objects.  Test your understanding:  In which sentence
is the word "quantity" uncountable?   1. In manufacturing,
quantity greatly affects the cost of production.   2. When
larger quantities are manufactured, production cost per unit
falls.  The grammar of Countable an