Population growth
Population growth
Population growth (/pɒpjʊˈleɪʃən ɡroʊθ/) refers to the increase in the number of individuals in a population. The term is often used in the context of human populations, but it is applicable to all living organisms.
Etymology
The term "population growth" is derived from the Latin word 'populus' meaning 'people', and the Old English 'growan', meaning 'to grow'.
Definition
Population growth can be defined as the change in population over a period of time. The change can be positive, indicating an increase in population, or negative, indicating a decrease. The rate at which the number of individuals in a population increases in a given time period as a fraction of the initial population is called the population growth rate.
Factors affecting population growth
Population growth is influenced by several factors including birth rate, death rate, and migration. The birth rate is the number of live births per 1,000 of the population per year. The death rate is the number of deaths per 1,000 of the population per year. Migration refers to the movement of people from one geographical area to another.
Related terms
- Population density: The number of individuals per unit area or volume.
- Population distribution: The pattern of where people live.
- Population dynamics: The study of how population sizes change over time and space.
- Demography: The statistical study of populations, especially human beings.
See also
External links
- Medical encyclopedia article on Population growth
- Wikipedia's article - Population growth
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