What is described as the amount of something or the number of things?

The term that describes the amount of something or the number of things is referred to as quantity. Quantity captures the essence of how much of a substance or number of items exists, making it a fundamental concept in mathematics, science, and everyday life. Whether counting objects, measuring liquids, or assessing the amount of a mixture, the notion of quantity is central to understanding and communicating numerical information.

Volume is typically associated with the three-dimensional space that a substance occupies, rather than just the amount in a numerical sense. Measurement refers to the process of determining the exact quantity of an attribute (such as length, weight, or time) but does not specify the amount itself. Value usually pertains to the worth or importance of something rather than a quantitative assessment. Thus, quantity is the direct term focused solely on the amount or number aspect.