population density

: the whole number of people or inhabitants in a country or region

: the total of individuals occupying an area or making up a whole

: the total of particles at a particular energy level

: the quality or state of being dense

: the quantity per unit volume (see ¹volume 2), unit area (see area 1), or unit length: such as

: the mass (see ²mass 1c) of a substance per unit volume