population density
A formal, statistical term for the number of people per unit area. Often used in demographic or urban planning contexts.
The population density of this area is very high.
人口密度 is the more common and general term for population density. 人口密集率 is a less frequent, more technical synonym.
Compound of 人口 (population), 密集 (crowding, density), and 率 (rate, ratio).