http://instapedia.com/m/[search keyword]
PC Instapedia >>
English Wikipedia Results:

Population density

Population density (people per km2) by country, 2006
Population density (people per km2) by country, 2006
Population density (people per km2) map of the world in 1994.
Population density (people per km2) map of the world in 1994.

Population density (in agriculture standing stock and standing crop) is a measurement of population per unit area or unit volume. It is frequently applied to living organisms, and particularly to humans. It is a key geographic term.

Contents


Biological population densities

Population density refers to the number of individuals per square kilometer of land area. It is a common biological measurement and is more often used by conservationists as a measure than population size.

Low densities may cause an extinction vortex and lead to further reduced fertility. This is called the Allee effect after the scientist who identified it. Examples of the causes in low population densities include:

Different species have different expected densities. R-selected species commonly have high population densities, while K-selected species may have lower densities. Low densities may be associated with specialized mate location adaptations such as specialized pollinators; as found in the orchid family (Orchidaceae).

Human population density

A street in Hong Kong, one of the most densely populated places in the world
A street in Hong Kong, one of the most densely populated places in the world
Mongolia is one of the least densely populated countries in the world, Monaco is currently the most. For humans, population density is the number of people per unit of area usually per square kilometer or mile (which may include or exclude cultivated or potentially productive area). Commonly this may be calculated for a county, city, country, another territory, or the entire world.

The world population is 6.8 billion http://www.census.gov/main/www/popclock.html, and Earth's area is 510 million square kilometers (197 million square miles) https://www.cia.gov/library/publications/the-world-factbook/geos/xx.html . Therefore the worldwide human population density is 6.7 billion ÷ 510 million = 13.1 per km² (34.0 per sq. mile), or 44.7 per km² (115.5 per sq. miles) if only the Earth's land area of 150 million km² (58 million sq. miles) is taken into account. This density rises when the population grows. It also includes all continental and island land area, including Antarctica. Considering that over half of the Earth's land mass consists of areas inhospitable to human inhabitation, such as deserts and high mountains, and that population tends to cluster around seaports and fresh water sources, this number by itself does not give any meaningful measurement of human population density.

Several of the most densely-populated territories in the world are city-states, microstates, micronations, or dependencies. These territories share a relatively small area and a high urbanization level, with an economically specialized city population drawing also on rural resources outside the area, illustrating the difference between high population density and overpopulation.

Cities with high population densities are, by some, considered to be overpopulated, though the extent to which this is the case depends on factors like quality of housing and infrastructure or access to resources. Most of the most densely-populated cities are in southern and eastern Asia, though Cairo and Lagos in Africa also fall into this category.

City population is, however, heavily dependent on the definition of "urban area" used: densities are often higher for the central municipality itself, than when more recently-developed and administratively unincorporated suburban communities are included, as in the concepts of agglomeration or metropolitan area, the latter including sometimes neighboring cities. For instance, Milwaukee has a greater population density when just the inner city is measured, and not the surrounding suburbs as well.

Other methods of measurement

While arithmetic density is the most common way of measuring population density, several other methods have been developed which aim to provide a more accurate measure of population density over a specific area.

See also

Lists:

External links

af:Bevolkingsdigtheid als:Bevölkerungsdichte ar:كثافة سكانية an:Densidat de poblazión ast:Densidá de población az:Əhali sıxlığı bn:জনসংখ্যার ঘনত্ব zh-min-nan:Jîn-kháu bi̍t-tō͘ be:Шчыльнасць насельніцтва be-x-old:Шчыльнасьць насельніцтва bar:Bevökarungsdichtn bs:Gustoća stanovništva br:Stankted ar boblañs bg:Гъстота на населението ca:Densitat de població cv:Халăх йышлăхĕ cs:Hustota zalidnění cy:Dwysedd poblogaeth da:Befolkningstæthed de:Bevölkerungsdichte et:Rahvastikutihedus el:Πυκνότητα πληθυσμού es:Densidad de población eo:Loĝdenso eu:Biztanle dentsitatea fa:تراکم جمعیت fo:Fólkatættleiki fr:Densité de population fy:Befolkingstichtens gl:Densidade de poboación ko:인구 밀도 hr:Gustoća stanovništva hi:जनसंख्या घनत्व io:Lojanto-denseso ig:Population density ilo:Densidad ti populasion id:Kepadatan ia:Densitate de population is:Þéttleiki byggðar it:Densità di popolazione he:צפיפות אוכלוסייה jv:Kapadhetan ka:მოსახლეობის სიმჭიდროვე kk:Жұрт тығыздығы ku:Berbilavî la:Spissitudo incolarum lv:Iedzīvotāju blīvums lb:Bevëlkerungsdicht lt:Gyventojų tankumas lij:Densitæ de popolaçion li:Bevoukingsdeechde lmo:Densitaa da abitaant hu:Népsűrűség mk:Густина на населеност ml:ജനസാന്ദ്രത mr:लोकसंख्या घनता ms:Kepadatan mn:Хүн амын нягтшил nl:Bevolkingsdichtheid nds-nl:Bevolkensdichtte ja:人口密度 no:Befolkningstetthet nn:Folketettleik oc:Densitat de populacion nds:Inwahnerdicht pl:Gęstość zaludnienia pt:Densidade populacional ro:Densitatea populaţiei rmy:Butvaripen le manushengo qu:Runa ñit'inakuy ru:Плотность населения sq:Dendësia e popullsisë simple:Population density sk:Hustota obyvateľstva sl:Gostota prebivalstva sr:Густина становништва sh:Gustoća stanovništva fi:Väestötiheys sv:Befolkningstäthet ta:மக்கள்தொகை அடர்த்தி roa-tara:Denzetà d'a popolazzione te:జన సాంద్రత th:ความหนาแน่นประชากร tg:Зичии аҳолӣ tr:Nüfus yoğunluğu udm:Улӥсьёслэн плотностьсы uk:Густота населення ur:کثافتِ آبادی vec:Densità de popołasion vi:Mật độ dân số vls:Bevolkiengsdichtheid wuu:人口密度 zh-yue:人口密度 bat-smg:Gīvėntuoju tonkoms zh:人口密度