Population Density

Definition Population Density: 

Population density is a measurement of population per unit area or unit volume. Population density refers to the number of people who live in a certain area. This can tell you how crowded the area is. 

It is frequently applied to living organisms and most of the time to humans. Population 

Density is a key geographical term.

Human population density

Monaco in Southern Europe, currently holds the record for being the most densely populated nation in the world.

Mongolia is the least densely populated country in the world.

This population cartogram of the European Union uses areas and colors to represent population.

For humans, population density is the number of people per unit of area, usually quoted per square kilometer or square mile (which may include or exclude, for example, areas of water or glaciers). Commonly this may be calculated for a county, city, country, another territory, or the entire world.

How to workout population of an area? 

divided by the total area is sq km (km2).

For example

to calculate the population density of the western cape which has a population of 6,016,900 and an area of 129,462 km2:

=6,016,900 ÷ 129,462 = 46,476

so the western cape has a population density of approximately 46 people per km2

Population of South Africa's provinces 

Since the election of 27 April 1994, South Africa has been divided into nine provinces. They vary widely in population, from the mostly-urban Gauteng, which contains over 20% of the national population, to the mostly-desert Northern Cape, which contains less than 3%. The following table shows the provincial populations according to the 2011 National Census^[1] and the most recent mid-year population estimate by Statistics South Africa.^[2]

Rank	Province	2011 census		2015 mid-year estimate
		Population	Percentage	Population	Percentage
1	Gauteng	12,272,263	23.7	13,200,300	24.0
2	KwaZulu-Natal	10,267,300	19.8	10,919,100	19.9
3	Eastern Cape	6,562,053	12.7	6,916,200	12.6
4	Western Cape	5,822,734	11.2	6,200,100	11.3
5	Limpopo	5,404,868	10.4	5,726,800	10.4
6	Mpumalanga	4,039,939	7.8	4,283,900	7.8
7	North West	3,509,953	6.8	3,707,100	6.7
8	Free State	2,745,590	5.3	2,817,900	5.1
9	Northern Cape	1,145,861	2.2	1,185,600	2.2
South Africa		51,770,561	100.0	54,956,900	100.0

Migration is the movement of people from one permanent home to another. This movement changes the population of a place. International migration is the movement from one country to another. People who leave their country are said to emigrate. People who move into another country are called immigrants.

Population growth

In biology, population growth is the increase in the number of individuals in a population.