Arithmetic Density of Population
Arithmetic density of population refers to the total number of people living in a given area. It is calculated by dividing the total population of a region by its total land area. This density measurement gives a basic understanding of how crowded or sparse a particular area is in terms of population.

Physiological Density of Population
Physiological density of population is a measure of population density that takes into account the amount of arable land available for agriculture in a region. It is calculated by dividing the total population of a region by its arable land area. This density measurement helps in assessing the pressure on available resources and the potential for sustainable agriculture in a region.

Agricultural Density of Population
Agricultural density of population is a measure of population density that focuses specifically on the number of farmers per unit of arable land in a region. It is calculated by dividing the total number of farmers by the total arable land area. This density measurement helps in understanding the level of agricultural productivity and the reliance of a population on agriculture for sustenance.
In summary, arithmetic density provides a general overview of population distribution, physiological density considers the relationship between population and arable land, and agricultural density focuses on the agricultural workforce and productivity in a region. Each of these density measurements offers unique insights into the population dynamics and resource utilization of a particular area.