TheGeoRoomPopulation Studies

Definition of the Day
Saturated Adiabatic Lapse Rate (salr)
The slow cooling of saturated air at 5°C/ km due to latent heat released during condensation. See Lapse Rates

Population Terms

TermDefinitionFormula
Age specific fertility rate Number of live births to a given age group num. of live births / num. of woman in that age group
Age specific death rate Number of deaths for a given age group
Ageing Population A population dominated by old age, retired people who are no longer or less economically active 65+. Caused by a high life expectancy & falling birth rate.
Birth Rate Number of live births per 1000 people live births / total population * 1 000
Carrying Capacity The number of people that can be supported by the available resources of a given area/ecosystem.
Child Mortality Number of children who die under 5 years of age. It encompasses both infant and neonatal mortlaity. NB: the age range may differ, some consider the child range below 14 yrs
Death Rate/ Crude Death Rate Number of deaths per 1000 people deaths / total population * 1 000
Dependency Ratio Number of uneconomically active people between 0 - 14 & 65 + who are dependent on 15 - 64 working age group. (0 - 14 + 65+)/ 15- 64
DTM A model showing birth & death rate changes and the resultant population changes at different stages of a population.
Emigrant One who leaves his/her place of living (country, city, town or village) to permanently or temporarily settle in a new area.
Fecundity The ability to reproduce offsprings.
Fertility The reproductivity of an individual or the whole population
Fertility rate Number of live birth ages 15 - 49 per 1 000 woman num. of births /woman 15 - 49 * 1 000
Immigrant One who settles in another area from somewhere.
Infant Mortality Number of children per 1 000 live births who die below one year. They encompass neonatal mortality and are in the under 5 mortality group. Num. of deaths below 1 yr / Num. of live births *1 000
Life Expectancy The number of years a person is expected to live if current mortality trends where to prevail throughout his/her lifetime.
Maternal Mortality The number of woman who die during pregnancy (pregnancy related deaths) or after 42 days (but less than a year) of delivery per 100 000 live births. num. of maternal deaths / total num. of live births * 100 000
Natural Change The differences between births and deaths in a population. Natural change can be an increase or decrease. Natural increase is when births are higher than deaths whereas natural decrease deaths are higher than births(negative). Natural change is a contributor to population growth along with migration. num. of births - num. of deaths
Neonatal Mortality Number of children per 1 000 live births who die, usually before a month but before a year. They are in the under 5 and infant mortality genre. num. of infant deaths > 28 and > 1 year/live births * 1 000
Net migration Net effect of immigrants or emigrants in an area. immigrants - emigrants
Population Change/ Population Growth An increase or decrease in population due to natural change and migration. Natural change (births - deaths) + Net migration
Replacement level The least number of children need to be reproduced by a woman in order to replace them in the population over the next generation. Recommended replacement level is 2.1 per woman but can vary with countries and mortality trends
Stillbirth A lifeless (dead) baby after 28 weeks of pregnancy.
Total Fertility Rate The number of children that would be born to a woman during her lifetime if she conformed to the age specific fertility rates of given year. 5 ∑ age specific fertility rate
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