<P> For humans , population density is the number of people per unit of area , usually quoted per square kilometer or square mile ( which may include or exclude , for example , areas of water or glaciers ) . Commonly this may be calculated for a county , city , country , another territory or the entire world . </P>
<P> For humans , population density is the number of people per unit of area , usually quoted per square kilometer or square mile ( which may include or exclude , for example , areas of water or glaciers ) . Commonly this may be calculated for a county , city , country , another territory or the entire world . </P>
the number of persons per square kilometer in a country is called
the number of persons per square kilometer in a country is called
population density
population density