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## Population Density

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### ... and put them inside the lines of your United States map. ... Look at a population map of China and the United States. Is the population spread out evenly? ... – PowerPoint PPT presentation

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Title: Population Density

1
Population Density
Exploring the relationship between population and
land area
2
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.

3
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.

4
Population in Theory
2005
2050
• If each of these boxes represent 1 square
kilometer and each black dot represents a person,
this is what the worlds population density would
look like in 2005 and 2050.

5
Population in Reality
2005
2050
• 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.

6
Purpose
• This exercise helps students compare the relative
population density of different countries and
examine its effects.

7
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

8
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

9
Lets 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
10
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
11
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?

12
Population in China and the U.S.
• What is the ratio of people in China to people in
the United States?

13
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 21, you would put
2 in the first pile and then 1 in the second pile
over and over until they are all gone.

14
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!

15
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.

16
Discussion
• Which country has more space per person?
• How do you think this would change a persons
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?

17
Maps
18
China
19
United States