Size refers to the concept of things, usually physical objects, having
measurements that are relatively greater or lesser than other things along certain
dimensions in
physical space, such as
length,
width,
height,
diameter,
perimeter,
area,
volume, or
mass. In mathematical terms, "[s]ize is a concept abstracted from the process of measuring by comparing a longer to a shorter". Size is determined by the process of comparing or measuring objects, which results in the determination of the magnitude of a quantity, such as length or mass, relative to a unit of measurement. Such a magnitude is usually expressed as a numerical value of
units on a previously established
scale, such as
meters or
inches.