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Means per capita he that dwelleth. The verb live, meanwhile, refers to live or reside. For example: "the inhabitants of the city have expressed their dissatisfaction with the measures taken by the Government", "our village has fewer capita because young people choose to live in cities," "no resident of this neighbourhood is impeccable."
The notion of capita, therefore, can be considered according to different scales. We can talk about the inhabitants of a House, a neighborhood, a city, etc. In a house or in a Department, the number of people is low compared to a neighborhood, a city, a province or a country.
All people in the world form what is called the human population. The statistical study of the population is called demography, whose etymological origin refers to the 'description of the population.
The population density is related to the distribution of the number of inhabitants in a territory. The surfaces are generally expressed in square kilometres: therefore, the population density is expressed in inhabitants per square kilometre.
Large cities have a high population density, often resulting in problems of housing, transport and security. Populations rurales (in the countryside, in the province), on the other hand, have a low density, poor infrastructure and little labor (some work).
Macau (which is a special administrative region of China), Monaco and Singapore are the most densely populated countries in the world. Among the countries with a lower density / least populous (but not necessarily those who have less inhabitants), it is appropriate to mention the Mongolia, the Iceland and the Australia.