Population density is defined as the number of persons per square kilometre of land.
The population density of a country can be expressed mathematically as:
|Total Population||Land area|
|i||Population density||Population density x land area|
|ii||Total population||Total population|
|Iii||Land area||Population density|
Example of population density
Calculate the population density of Nigeria, having a total population of 88,514,501 as of 1991 with a total land area of923,768 sqkm. Solution
Total population = 88,514,501
Total land area = 923,768 km2
Population density = Total population
Total land area = 88.514.501
= 96 persons /km2
Population density may either be high or low depending on the number of people in a specified area or country. Generally, high population density occurs where there are many people in an area which leads to over population as discussed earlier.
Similarly, a low population density refers to a situation where there are few people in a specified area of land.