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## PowerPoint Slideshow about ' Population Density' - winter-ball

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### Population Density

Exploring the relationship between population and land area

Population in 2005

- The population of the world by the end of 2005 will be approximately 6,464,750,000 people.
- The population density of the world in 2005 is 48 people per square kilometer.

Population in 2050

- How old will you be in 2050?
- Do you think you will havechildren of your own in 2050?
- The projected population of the world in 2050 is 9,075,903,000.
- The projected population density is 67 people per square kilometer.

Population in Theory

- If each of these boxes represent 1 square kilometer and each black dot represents a person, this is what the world’s population density would look like in 2005 and 2050.

2005

2050

Population in Reality

- In reality, the population density much more dense in some places than others. Urban areas are more dense than rural areas, and some countries are more dense than others.

2005

2050

Purpose

- This exercise helps students compare the relative population density of different countries and examine its effects.

The World

- The total population of the world is:
- Approximately 6,326,005,560 people

- The total land area of the world is:
- Approximately 510,072,000 sq km

World Population

- The three most populous countries are:
- China - 1,273,111,290 people
- India - 1,029,991,145 people
- United States - 278,058,881 people
- Their land areas are:
- China - 9,326,410 sq km
- India – 2,973,190 sq km
- United States - 9,158,960 sq km

Let’s Round the Numbers

- Take these numbers and round them to the nearest hundred million.

China - 1,273,111,290

≈ 1,300,000,000

Hundred million place

≈ 1,000,000,000

India - 1,029,991,145

Hundred million place

≈ 300,000,000

- United States - 278,058,881

Hundred million place

More Rounding!

- Then round these numbers to the nearest million.

China - 9,326,410 sq km

≈ 9,000,000 sq km

Millions place

- India – 2,973,190 sq km

≈ 3,000,000 sq km

Millions place

- United States - 9,158,960 sq km

≈ 9,000,000 sq km

Millions place

Land Resources in China and the U.S.

- Take your rounded numbers for the areas of China and the United States and find the ratio of land area between China and the United States.
- Do the figures you calculated seem to match the relative sizes of the countries on the two maps?

Population in China and the U.S.

- What is the ratio of people in China to people in the United States?

Population in China and the U.S.

- Take the candies and separate them into groups representing the ratio of people in China and the U.S.
- It is easy to do this by taking the ratio and count that number for each pile until they are all gone.
- For example: If the ratio was 2:1, you would put 2 in the first pile and then 1 in the second pile over and over until they are all gone.

How many people per candy?

- Now count the number of candies that you have in the China pile. How many people are represented by each candy?
- Example if you have 50 candies in the China pile and there are 1,300,000,000 people in China then:

2

6

,000,000

50

1,300,000,000

-10

300

This means with 50 candies

each candy represents

26,000,000 people.

-300

0

- Now you can do the same with the United States numbers!

Putting It All Together

- Now take the candies that are for China and put them inside the lines on your map.
- Then take the United States candies and put them inside the lines of your United States map.

Discussion

- Which country has more space per person?
- How do you think this would change a person’s experience living in that country?
- Look at a population map of China and the United States. Is the population spread out evenly? Why or why not?

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