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what do you mean by the term population density ?

Population density (people per km2) by country, 2006
Population density (people per km2) map of the world in 1994 (detailed).
Population density (people per km2) map of the world in 1994.

Population density (in agriculture standing stock and standing crop) is a measurement of population per unit area or unit volume. It is frequently applied to living organisms and particularly to humans. It is a key geographic term

 

Population density is population divided by total land area.

Low densities may cause an extinction vortex and lead to further reduced fertility. This is called the allee effect after the scientist who identified it. Examples of the causes in low population densities include.

  • Increased problems with locating mates.
  • Increased inbreeding.Different species have different expected densities. R-selected species commonly have high population densities, while K-selected species may have lower densities.
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Population density is an often reported and commonly compared statistic for places around the world. Population density is the measure of the number per unit area. It is commonly represented as people per square mile (or square kilometer), which is derived simply by dividing... For example, Canada's population of 33 million, divided by the land area of 3,559,294 square miles yields a density of 9.27 people per square mile. While this number would seem to indicate that 9.27 people live on each square mile of Canadian land area, the density within the country varies dramatically - a vast majority lives in the southern part of the country. Density is only a raw gauge to measure a population's disbursement across the land.

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in a simple way =

it means the number of persons that live in 1 sq km of area 

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It means the number of persons that live in one sq. km of area e.g the population density of uttaranchal is 156 while the density of west bengal is 904 and that of bihar is 880.
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You can find ur answer here

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Density of population means the average number of persons living per unit area
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Okay
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