Population Density

Density can be computed in up to three different ways for a place. People look at Arithmetic density. You get that when you divide the population by the land area. Physiological Density is the number of people supported by a unit of arable/farm-able land. You get this by dividing the population by the arable land area. Agricultural Density is the Ratio of the number of farmers to the amount of arable land. You get this by dividing the population of farmers by the arable land area. Geographers measure population change in a country or the world as a whole by using these three measures, Crude Birth Rate, Crude Death Rate, and the Rate of Natural Increase.