What is what does quantity mean?

Quantity refers to a measurable amount or number of something. In other words, it is the amount of a substance, item, or object that can be measured or counted. This could refer to anything from the number of apples in a basket to the weight of a box of cereal, the volume of water in a tank, or the amount of time it takes to complete a task. Quantity is often expressed using units of measurement such as grams, liters, minutes, or pieces. It is a fundamental concept in mathematics, science, and many other fields of study.