Arithmetic density refers to the total number of people divided by the total land area
Arithmetic density lets geographers compare the number of people living on a given piece of land in different regions of the world
Physiological density is the number of people supported by a unit area of arable land
Physiological density
Comparing physiological and arithmetic densities helps geographers understand the capacity of the land to yield enough food for the needs of the population
Agricultural density is the ratio of the amount of arable land
Agricultural density
measuring agricultural density helps account for economic differences.Geographers examine a country's physiological and agricultural densities together.