# How To Calculate Arithmetic Population Density? (Solved)

The formula we use to determine arithmetic density is as follows: Arithmetic Density = Total Population / Total Land Area.

## How do you find the arithmetic population?

Arithmetic Density One can find this by dividing the total number of people in an area by the total land area. For example, to find the arithmetic density for the US, you divide the amount of people (300 million) by the amount of land (3.7 million square miles) and you get 80 people per each square mile.

## What is arithmetic population density?

The first method used to measure population density is the arithmetic density, which is the total number of people in any given area as compared to one square unit of land. The total number of people is divided by, for example, one kilometer, to determine the average density on that acre.

## How do you find population density?

To calculate the population density, you will divide the population by the size of the area. Thus, Population Density = Number of People/Land Area. The unit of land area should be square miles or square kilometers. You can use square feet or meters if you are finding the density of a smallish space.

## How do you find the arithmetic mean?

One method is to calculate the arithmetic mean. To do this, add up all the values and divide the sum by the number of values. For example, if there are a set of “n” numbers, add the numbers together for example: a + b + c + d and so on. Then divide the sum by “n”.

## Why is arithmetic density also called crude density?

Arithmetic (crude) Density To get crude density, divide the total land area by the total population. You can see that when you measure a large area of land, the arithmetic density becomes meaningless because it “blends in” the urban population and masks the sparsely-inhabited areas with an average.

## What are the 3 methods for calculating population density?

The three methods for calculating population density are arithmetic, physiological and agricultural. The method used to calculate population density reveals different information about the pressure the population exerts on the land.

## Is population density the same as arithmetic density?

Population density is a measurement of the number of people in an area relative to its size. Arithmetic density, also known as real density, is very simply the total number of people divided by the total land area.

## What is Japan’s arithmetic population density?

Japan’s arithmetic density is 338 people per square kilometer.

## What is population density example?

Population density is the average number of individuals in a population per unit of area or volume. For example, a population of 100 insects that live in an area of 100 square meters has a density of 1 insect per square meter.

## How is population density calculated quizlet?

Population density is calculated as the total number of organisms of a species found in an area divided by the size of the habitat.

## What is population density how it can be calculated Class 12?

The population density is calculated as the total number of individuals of a population divided by the total area covered by the peoples.

## What is the arithmetic mean between 10 and 24?

Using the average formula, get the arithmetic mean of 10 and 24. Thus, 10+24/2 =17 is the arithmetic mean.

## Population Density Calculator

A good geometric explanation of negation may be found as well. Given that x+yi=– x–yi, it follows that the negation of a complex number will be situated just opposite 0 and at the same distance away from it. z= 2 I for example, is located two units to the right and one unit to the up, while its negation is located two units to the left and one unit to the down, as shown in the diagram below. As with every transformation of the planeC, negation may be thought of as such. After rotating the plane 180 degrees around 0, every pointzi is delivered to its negative – the pointz negativity – and vice versa.

You can figure out what the geometric rule for subtraction is based on the addition and negation of numbers.

Subtraction ofwas may be interpreted as a transformation ofC: the plane is moved along the vector from 0 to – w in the direction of the minus sign.

• A population growth calculator, a percent growth calculator, and a percent decline calculator are all available online.

## Population Density Formula

In order to determine the population density of a given region, the following equation should be used: D = P / A is the denominator.

• Where D represents the density, P represents the population number, and A represents the area.

In the case of population density, we take into consideration the total number of people living in a certain unit of territory. Normally, in mathematics, density is defined as the amount of mass or number per unit volume. When it comes to population analysis, looking at volumes doesn’t make much sense, therefore we look at area instead.

## Population Density Definition

A population density is defined as the total number of people living in a given area divided by the area of the unit of measurement.

## Population Density Example

What is the formula for calculating population density? An example issue is provided below that shows the processes that must be completed in order to calculate a population density. To begin, select a specific topic of interest that will be investigated. For the sake of this example, we will utilize the city of New York as the location. As of the year 2019, the city has a population of 8.419 million people. This just includes the boroughs of New York City and does not include the whole metropolitan region.

According to the solution to this issue, the city of New York has a total area of 302.6 square miles.

## Population Density Units

Typically, population density is expressed as the number of people per square mile or the number of persons per square kilometer in the majority of situations. When examining densely populated locations, such as New York, these units can be stated in terms of per thousand people, as seen in the example above, which is per thousand people.

## 6 Things to Know About Population Denisty

1.What is the significance of population density? Population density is an important indicator in understanding not just the economics and logistics associated in a certain location, but also the culture and attitude of the people who live in that place as well. Urban planning is a good example of the significance of this concept in everyday life. Engineers must take into account population density while designing bridges, sewage systems, and other infrastructure for a certain area of the world.

1. Because of the lack of this vital knowledge, the engineer may build something that will break under heavier than anticipated usage conditions.
2. When the number of people living in a certain region rises or decreases, the population density of that area will vary.
3. A drop in population will result in a reduction in population density.
4. According to the equation above, this is the case.
5. Suppose a town had an initial extent of 20 square miles, but after several legal battles, the municipality agreed to incorporate an additional 1 square mile area inside its limits.
6. 3.
7. Temperatures and climate can be influenced by population density.

As the world’s population continues to grow, the global climate catastrophe has only become worse, according to the United Nations.

Temperatures throughout the world rise as a result of this.

When compared to the surrounding areas, the temperature in the city rises as the population density increases.

4.

According to the United States Census Bureau, urban areas must have a population density of at least 1,000 persons per square mile and a population of at least 50,000 people.

5.

The benefits and drawbacks of having a low population density are both present.

Low population density has a number of disadvantages, including reduced productivity, longer commuting times, a lack of variety in social groupings, and lower pay, among other things.

6.

In the globe, the most densely populated locations are all big cities, with the highest population density being in Manilla, Philippines, which has a density of around 107,000 people per square mile.

In fact, the Philippines is home to the world’s top three densest cities, all of which are located in the country.

## how to calculate arithmetic density

Density in Arithmetic This may be calculated by dividing the total number of inhabitants in a region by the entire land area of that region. For example, to calculate the arithmetic density for the United States, divide the total number of people (300 million) by the total area of land (3.7 million square miles) and you will obtain an average of 80 people per square mile of land.

## What is arithmetic density and how is it calculated?

In order to calculate arithmetic density, we must apply the following formula: Arithmetic Density is defined as the total population divided by the total land area.

## What is arithmetic density of population?

To determine population density, the first approach is called arithmetic densities, which is defined as the total number of people in a particular region divided by the area of one square kilometer of land. The average density of people on an acre is calculated by dividing the total number of people by a unit of distance, such as one kilometer.

## What is the formula for population density?

When it comes to population density, the formula is Dp= N/A, where Dp is the population density and N is the total number of people in the country, and A is the land area covered by the population. A is often represented in terms of square miles or square kilometers when referring to human populations.

## What is arithmetic density in human geography?

Numerical density: The total number of people divided by the entire area of territory covered by a population. This is what most people think of when they think of density: the number of people living in a given amount of land. Physiological density is defined as the number of people living in a given unit of arable land, which is land suitable for agricultural production.

## What are examples of arithmetic density?

This sort of measurement is referred to as arithmetic density, and it is expressed as the total number of people living on a certain land area. For example, as of 2014, the population density in the Nile Delta is 1000 persons per square kilometer of land area. In other words, an average of 1000 people live in a 1 km2 region, which is 1 km2 in size.

## What is China’s arithmetic density?

China’s current population density in 2021 is 150.44 people per square kilometer, representing a 0.34 percent growth over the previous year. China’s population density in 2020 was 149.93 persons per square kilometer, representing a 0.39 percent rise over the previous year.

## What are the 3 methods for calculating population density?

Three techniques of determining population density are available, including mathematical, physiologic, and agricultural approaches. Depending on the technique employed to measure population density, various information is revealed regarding the pressure that the people places on the land.

## How are the 3 types of population density calculated?

With this in mind, the most commonly used method of calculating population density is the number of people per square kilometer. The density of a population is frequently assessed in three distinct ways. There are several types of density, including mathematical density, physiological density, and agricultural density.

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## What is the arithmetic density of the United States?

Throughout the United States, population density has been measured for more than two hundred years.

… From 1790 to 2019, the population density of the United States was measured in inhabitants per square mile of land area.

Characteristic Residents per square mile of land area
2019 (July 1)* 92.9
2010 (April 1) 87.4
2000 (April 1) 79.6
1990 (April 1) 70.3

## How do I calculate population density in Excel?

The average number of persons in a population per unit of area or volume is referred to as population density. For example, a population of 100 insects living in an area of 100 square meters has a density of one bug per square meter, indicating that the population is densely packed.

## What is the difference between physiological density and arithmetic population density?

Arithmetic density, also known as real density, may be calculated by dividing the total number of people by the entire land area of a given location. The physiological density of a population is the number of people living in a given amount of arable land.

## How do geographers use arithmetic density?

Geographers most usually utilize arithmetic density, which is defined as the total number of items in a given region (Figures 2.2 and 2.3.). Population density in population geography is defined as the total number of people divided by the entire area of land covered by the population. To calculate the arithmetic density, divide the population by the land area of the area under consideration.

## What is arithmetic density quizlet?

Arithmetic Density is a measure of how dense a set of numbers is. The total number of people divided by the total geographical area is known as the population density. For example, the arithmetic density in the United States is 80 people per square mile. Physiological Density is a measure of how dense a person’s body is.

## What are the three methods for calculating population density and how are they factored?

Arithmetic, physiological, and agricultural population densities are the three approaches for calculating population densities, respectively. Although both arithmetic and physiological densities are used to determine how many people are living on each square of land, arithmetic density is used to determine how many people are living on each square of arable land.

## How do you calculate population density in geography?

When calculating density, divide the number of items by the area of the object being considered. The population density of a nation is defined as the number of people living in that country divided by the country’s total land area, measured in square kilometers or square miles.

## What is the arithmetic density of Australia?

3.1 persons live per square kilometer of land. The population density varies substantially from region to region in Australia. At the end of June 2016, the population density in Australia was 3.1 persons per square kilometer (sq km).

## What is the arithmetic density of Canada?

On a per-square-kilometer basis, the population density of Canada was around 4 persons in 2018. … From 2008 to 2018, the population density of Canada has increased (inhabitants per square kilometer)

Characteristic Inhabitants per square kilometer
2018 4.13
2017 4.08
2016 4.03
2015 3.98

## What is Japan’s arithmetic density?

Japan has an arithmetic density of 338 persons per square kilometer of land area. Physiological density, or the number of people per unit of arable land, is a more accurate measure of population density in Japan than the population density index.

## What is the arithmetic density of India?

Approximately 454.95 individuals per square kilometer of land area was the population density in India as of 2018. … From 2008 to 2018, the population density of India has increased (inhabitants per square kilometer)

Characteristic Inhabitants per square kilometer
2017 450.25
2016 445.49
2015 440.66
2014 435.76

## What is the arithmetic density of Russia?

Approximately 8.82 people live per square kilometer of land.

In 2018, the population density in Russia was around 8.82 persons per square kilometer of land surface. … From 2008 to 2018, the population density of Russia has increased (inhabitants per square kilometer)

Characteristic Inhabitants per square kilometer
2018 8.82
2017 8.82
2016 8.81
2015 8.8

## What is low arithmetic density?

Australia, Canada, and even the United States are examples of countries with low arithmetic density. Physiological Density is a measure of how dense a person’s body is. Physical density, defined as the number of people supported by a unit amount of arable land, is found in both high and low concentrations in many places across the world. Egypt would be considered a country with a high physiological density.

## Why is arithmetic density also called crude density?

Density in Arithmetic (Crude) Form Simply divide the total land area by the total population to obtain the crude density. The arithmetic density, when applied to a vast region of land, becomes meaningless since it “blends in” the urban population and conceals the sparsely populated areas with an average. This is seen in Figure 1.

## What does the arithmetic population density tell you about each country?

An indicator of population density is a statistic that indicates how many people dwell in a certain region. This sort of measurement is referred to as arithmetic density, and it is expressed as the total number of people living in a certain area of land.

## How do you calculate population density examples?

Calculate the population by dividing the area by the population. Long division can be used, or you can just use a calculator. When we divide 145,000 by nine, we get a population density of 16,111 persons per square mile in our hypothetical example.

## How do you calculate residential density?

CALCULATION OF DENSITY: The density of a building is computed by dividing the total lot area by the number of units. Example: If there are 40 residential lots on a ten-acre property with a gross density of 4 units per acre (40 units/10-acres = 4 units/acre), the gross density is 4.

## What is the arithmetic density of France?

France’s population density from 1961 to 2018 is shown in the graph below. French people were packed into 122.34 people per square kilometer (47.24 people per square mile) of land area in 2018.

## What is the world’s arithmetic density?

The world’s population is around 7,800,000,000, while the total area of the Earth (including land and sea) is approximately 510,000,000 km2 (197,000,000 sq. mi.). As a result of this extremely rudimentary form of computation, the worldwide human population density is around 7,800,000,000 510,000,000 =15.3 people per square kilometer of land area (40 per sq.mi.).

## How do you calculate population density using census?

Human population and housing unit density (measured in persons per square mile or square kilometers) are calculated by dividing the total population or number of dwelling units within a geographical entity by the land area of that entity (measured in square miles or square kilometers).

## How is population density calculated quizlet?

What is the formula for calculating population density? The population density of a species is estimated by dividing the total number of organisms of a species present in a region by the total area of the habitat.

## How is population density calculated in Canada?

The formula for calculating population density is the total population divided by the total land area.

## What is the unit for population density?

The most often used unit of population density in the United States is the person per square mile.

## How do you calculate total population size?

Obtaining an estimate of the population size is accomplished by dividing the number of persons getting a service or the number of unique objects dispersed (M) by the proportion of individuals in a representative survey who report having received the service or object (P).

## How to calculate Arithmetic Density and Physiological Density of population

density in the physiological realm how to determine the density of agricultural production an illustration of physiological density In order to determine the physiological density of a country, what is the formula to use? Why is physiological density essential in terms of the arithmetic density of the United States? physiological density at an elevated level Calculator for the arithmetic population See more entries in the FAQ category.

## How to Calculate Population Density

density of the physiological system Agricultural Density Calculation Guide Physiological density as an illustration In order to determine the physiological density of a country, what is the formula to use is When it comes to arithmetic density in the United States, why is it so important? physiological density at an optimum level Calculator for arithmetic population Browse through our collection of articles in the FAQ category.

1. 1 Define the scope of the project. Determine the geographic borders of the region for which you wish to obtain information on population density. Consider why you desire this particular number. Perhaps you’re interested in learning about the population density of your nation, your city, or even your own neighborhood. You’ll need to figure out the entire area of this location, which is commonly measured in feet, miles, meters, or kilometers.
• It’s likely that someone else has previously taken measurements and conducted a survey in this region. See whether there are any established borders in the region by looking at census statistics, reading an encyclopedia, or conducting a web search. If not, you’ll have to come up with something on your own. You may need to design the boundaries of a neighborhood if it is not included in the census
• Otherwise, you may need to create your own.
• 2 Determine the size of the population. Other than conducting your own population census, you’ll need to locate a current record of the number of individuals that reside in this neighborhood. Begin by conducting an online search for the population of the location in question — for example, the city of Houston, Texas. When looking for a generally precise statistic, go for the most current census data. If you’re seeking for information about a country’s population, the CIA World Factbook is an excellent resource
• Otherwise,
• In some cases, such as when estimating the population density for a new region that has not yet been recorded, you may be required to conduct your own population count. For example, a popularly defined urban neighborhood or a kangaroo population in a region of the Australian Outback may be included in this category. Make an effort to obtain the most exact figure feasible
• If you are attempting to calculate the population density of a region that has not yet been recorded, you may be required to conduct your own census. For example, a popularly defined urban neighborhood or a kangaroo population in a portion of the Australian Outback might be included in this classification. As much as feasible, try to acquire an exact figure
1. 1 Understand the formula. To determine the population density, divide the total population by the total area of the region under consideration. As a result, population density is equal to the number of people divided by the land area.
• The unit of land area should be in square miles or square kilometers, depending on the situation. If you are trying to figure out the density of a little place, you can use square feet or meters. However, for the majority of professional and academic demographic needs, you’ll need to stick with the usual square miles or kilometers. The population density is measured in terms of persons per unit of land area. For example, a population density of 2000 persons per square mile.
1. 2Insert your information into the formula. You should be familiar with the population and land area of the region. Example: If there are 145,000 people living in the city of Auburn and the urban area is 9 square miles, write 145,000/9 square miles
2. 3Divide the population by the size of the urban area. Long division can be used, or you can just use a calculator. When we divide 145,000 by nine, we get a population density of 16,111 persons per square mile in our hypothetical example. Advertisement
1. 1 Compare the density of the population. Comparing statistics from several places and making notes about those areas based on the differing population densities is a good way to start. To provide an example, if the city of Boonesville has 60,000 people living inside its 8 square miles, then the population density is 7,500 people per square mile. According to the data presented, the population density of Auburn is significantly higher than the population density of Boonesville. Check to see if you can draw any judgments about the two cities based on the differences.
• Even if you compute the population density of a densely populated area such as a major city, the resultant number will not provide you with much information about the disparities between particular neighborhood populations. It is possible that you may need to determine the density for multiple area scales in order to completely comprehend a location
• 2Consider adding population growth in your calculations. Calculate the expected population increase for a specific region, and then compare the present population density with the estimated future population density to see which is higher. Look for census data from the past and do a comparison between the previous and present population densities to see how they compare. Make an effort to comprehend how a location has changed and will continue to change
• 3 Be conscious of your limitations. Although it is simple and uncomplicated to calculate population density in this manner, it may not provide more nuanced data about a given location as it should. The size and nature of the region for which you are measuring population density have a significant impact on the outcome of the calculation. Bigger areas that contain both inhabited and unoccupied land can benefit from the formula, while smaller, densely populated regions may benefit more from it than larger areas that include both inhabited and undeveloped land.
• Consider the following scenario: you are attempting to determine the population density of a county that has a considerable amount of open space and national forest, as well as a very major metropolis. You will not learn much about city density from the population density of the county as a whole
• Instead, you will learn more about it from the physical place where people dwell
• It’s important to remember that population density is only an average. It is possible that it does not correlate perfectly to the population count of a certain area. If this is not the case, explore why. Experiment with determining the density for a smaller region within the larger area.
1. 4Consider the data in detail. When you know about high and low population densities in a certain location, you may make predictions about that area. For example, high population densities are associated with higher crime rates as well as higher prices for housing and other items. Low-density areas are more likely to have agricultural land, and they are also more likely to have wilderness or open space. The conclusions that you reach on a certain area or areas will be determined by your objectives. Consider how you can make this information more enlightening. Advertisement
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• Question What is the best way to build a formula for population calculation? Calculate the land area by dividing the number of individuals who are present in a specific location and at a specific time. Question What is a bio-reserve, and why do we need them? The term “bio-reserve” refers to a geographical region that has been set aside for the preservation of wildlife and other environmental components. Question When I am given the total area and the number of housing units, how do I compute the density of the area? You would need to know the average number of individuals that live in each unit in order to calculate this. To find the total area, multiply that number by the number of units, and then divide that result by the entire area. Question In the absence of a census, how can I compute the rate of growth? All you can do is make educated guesses about the current population and compare them to prior populations. Subtract the smaller number from the bigger number, and then divide the result by the length of time that has elapsed. For example, your response may be represented in terms of the number of persons each year
• Question What exactly does the term “population density” mean? Population density is a measure of the number of people living in a certain region
• Question What happens if my answer contains decimal places or is less than one? It is reasonable to anticipate that your response will contain decimal places. That would not be out of the ordinary. As for “smaller than 1,” that just indicates that there aren’t very many individuals there at the time of the measurement. Question Why are the units used in a population density estimate squared rather than cubed in nature? Because people live in regions measured in square units (such as miles or kilometers), rather than cube measurements (such as square miles or kilometers)
• Question I’m not sure how to solve for the size of an area if I don’t know how many organisms there are or what their population density is, but I know how many organisms and what their population density is. Multiply the number of creatures by the density of the organisms
• Question What is the formula for calculating population density per square mile? Calculate the total population by dividing it by the number of square miles occupied by the population under consideration. Question What is the formula for calculating agricultural density? The agricultural density of a region is computed by dividing the area of arable (farmable) land by the number of farmers in that region.

• Contrast the information you gathered with other reports on population density. It is important to analyze probable inaccuracies or changes in population density over time if the population density you discovered differs from the data presented. Calculate the population density of animals, such as cattle, using the same formula as previously described.

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## Things You’ll Need

Summary of the ArticleXTo determine population density, begin by determining the total number of people who reside in the region in which you are interested. Then calculate the square miles of the region’s land area. Finally, divide the number of people living in the region by the size of the region to obtain the population density for the region. Fill in the blanks with the number of people living in a square mile. Continue reading for assistance in analyzing your findings! Did you find this overview to be helpful?

Dabldy/iStock/GettyImages It is a measure of how congested (or how uncrowded) a given area of land is when referring to population density. It is important for governments to maintain track of population density so that those in control have an understanding of how many citizens dwell in a certain region and can offer services in accordance with that number of citizens. It is in fact true that the United States Census Bureau keeps close track of population density in various parts of the United States in order to work with the National Hurricane Center to explain how many people and businesses a storm may effect.

1. Choose the area in which you want to calculate the population density and click on the “Calculate Population Density” button. In general, the smaller your region is, the more correctly your calculations will depict that specific area. Larger regions provide a far inferior estimate of the population density at a given place than smaller areas. To provide an example, if you estimated the population density of New York as a full state, you may come up with a figure that is around average. The population density of an area in upstate New York and a population density of an area in Manhattan, on the other hand, would result in two wildly different values, each of which would better characterize the area in which it was computed. Locate the region of the site where you wish to calculate the population density and note down the coordinates. Depending on where you get your information, this area might be stated in square miles, acres, or square meters. Just make sure that you maintain the same units throughout the entire computation. Find out how many people live in the location you’ve chosen. Make a fraction using the appropriate units for the population density you are calculating. Population density is often expressed in terms of the number of people living in a given region by scientists and sociologists. If you want a valid fractional expression, you must have the number of people in the numerator (the top of your fraction) and a unit of square miles/meters/acres in the denominator (the bottom of your fraction) (on the bottom.) If a city has a population of 8,341 individuals who live in a 25-square-mile area, that population would be stated as a percent of that area: 8341 / 25. Convert the fraction to a unit area, such that the final result is the number of people who live on one acre, one square mile, or one square meter of land, for instance. Alternatively, you may conceive of it as carrying out the division indicated by the fraction symbol. The population density of a town with a land area of 25 square miles and a population of 8,341 people would be calculated by dividing 8,341 by 25 to get at 333.64 persons per square mile. If required, round your answer from Step 5 up or down to a full number if it was not already rounded. Due to the fact that the population density is only an average, you may wind up with a decimal
2. Nevertheless, because the real population is constituted of whole people, rounding your response will also reflect your answer in whole persons.

Information about the authorEthan Schwartz has worked as a scientist and freelance writer for the past year, authoring scientific literature for “Gene Therapy” as well as pieces on education, health, and personal finance for eHow. Schwartz received a Bachelor of Science in biological sciences from the University of Michigan in 2009, and he will attend medical school in July 2010.

## Population Density Definition

Statistics Terms and Definitions Density of the population

## Human Population Density

Population density is a statistic that informs you how many people dwell in a given region of a country. In general, population density is expressed as a number of people per square mile or square kilometer, and may or may not include bodies of water. This sort of measurement is referred to as arithmetic density, and it is expressed as the total number of people per unit area of land.

According to the United Nations Development Programme, the Nile Delta has a population density of 1000 persons per square kilometer as of 2014. In other words, an average of 1000 people live in a 1 km2 region, which is 1 km2 in size.

### Formula

The calculation for population density is as follows: number of people per square mile (or square kilometer) of land. The definition varies widely depending on which institution or agency is responsible for reporting the statistic. As an illustration:

• Population density, according to the World Bank, is defined as “midyear population divided by land area in square kilometers.” The numbers from the World Bank include all of the people who live on a piece of land. This includes illegal aliens, but excludes refugees (who are considered residents of their country of origin) and other temporary residents who are not considered residents of their country of origin. The term “land area” excludes major rivers and lakes
• The University of Florida estimates population density by first eliminating blocks of land where no one lives before include those blocks of land that do have people living on them (like parks, wetlands and forests). Including this region (38 percent of Florida is absolutely deserted), according to the university, might result in misleading data regarding genuine population density in areas where people actually dwell.

Map of the world’s population density. Image courtesy of Leftcry/Wikimedia Commons Aside from arithmetic density, there are many more forms of pop. density measurements that are less common:

• Residential density is defined as the ratio of the number of people living in urban areas to the amount of residential land. Urban density is defined as the ratio of the number of people living in an urban area to the amount of urban land. Agricultural density (also known as physiological density) is defined as the ratio of the number of people living in a rural region to the area of arable land.