The number of people living per unit of area, usually expressed as people per square kilometer or square mile. This measure helps compare how crowded different places are and influences everything from infrastructure needs to environmental impact.
Compound of 'population' (from Latin 'populus,' people) and 'density' (from Latin 'densus,' thick). The combined concept emerged in 19th-century demographic studies as governments needed to understand spatial distribution of citizens for planning and resource allocation.
Monaco has a population density of 26,000 people per square kilometer – imagine fitting the entire population of a mid-sized city into just one square kilometer! Meanwhile, Mongolia has only 2 people per square kilometer, meaning each person could have half a square kilometer to themselves.
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