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The physiological density
or real population density
is the number of people
A population is all the organisms that both belong to the same group or species and live in the same geographical area. The area that is used to define a sexual population is such that inter-breeding is possible between any pair within the area and more probable than cross-breeding with individuals...
per unit area of arable land
In geography and agriculture, arable land is land that can be used for growing crops. It includes all land under temporary crops , temporary meadows for mowing or pasture, land under market and kitchen gardens and land temporarily fallow...
A higher physiological density suggests that the available agricultural land is being used by more and may reach its output limit sooner than a nation that has a lower physiological density.