Physiological Density is the number of people per unit area of arable land - land suitable for agriculture.
Let's go back to our concert analogy but this time we're only counting seats not aisles or stages because they're not suitable for fans to sit (arable land). If there are 1000 fans and only 1500 seats, the physiological density is higher than the arithmetic density.
Agriculture: The science or practice of farming, including cultivation of the soil for growing crops and rearing animals to provide food, wool, and other products.
Land Use: The function of land that is determined by economic factors as well as social and governmental policies.
Sustainability: Meeting the needs of the present without compromising the ability of future generations to meet their own needs.
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