Physiological population density is a measure of the number of people per unit of area of arable land, which is land that can be used for agriculture.

Crude population density is a measure of the number of people per unit of area of land, which includes both arable land and non-arable land.

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Physiological population density is a more accurate measure of the number of people that can be supported by a given area of land.

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The world's average physiological population density is 2.5 people per square kilometer of arable land.

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The world's average crude population density is 10 people per square kilometer of land.

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China has the world's highest physiological population density, at 3.6 people per square kilometer of arable land.

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India has the world's second highest physiological population density, at 3.1 people per square kilometer of arable land.

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The United States has a physiological population density of 2.7 people per square kilometer of arable land.

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The United Kingdom has a physiological population density of 2.4 people per square kilometer of arable land.

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Japan has a physiological population density of 2.3 people per square kilometer of arable land.

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