# Communicating with Graphs

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```					Communicating with Graphs

Physical Science
In science, we use a lot of graphs

This graph shows the temperature changes in the Pacific Ocean
The year (time ) is plotted on the x axis
The temperature is plotted on the y axis
Graph of light from Pluto
• The wavelength is on the x axis
• The albedo (light intensity) is on the y axis
methane
Graphs are useful to analyze
information
• Stockmarket - bargraph

Electrocardiogram – EKG – measures heart
function on a line graph
Pie graphs – hmm sounds tastey!
• Each set of data has a piece of the pie!
Line Graph Acivity
Activity: Plot the temperature of your ice water.

* Write the Title “ The Cooling Curve of Ice Water”
• Label the horizontal (x) axis – time (seconds)
• Label the vertical (y) axis – temperature ( Celsius)
• Plot points - The points or dots on the graph show data
• Connect the points – The lines connecting the points
give estimates of the values between the points.
• Use different colored lines for each set of data
Bar Graphs
• Bar graphs useful for comparing
information collected by counting
• Useful for counting number of items at a
particular time (x axis)
Bar Graph Activity
• Make a bar graph of the following information
• Title: Number of Students in Physical Science
• X axis: 1st period; 2nd period; 3rd period; 4th period; 5th period and 6th
period.
• Y axis: number of students (1-30)
• 1st period = 21
• 2nd period = 17
• 3rd period = 29
• 4th period = 22
• 5th period = 22
• 6th period = 27
Circle or Pie Graphs
• Used to show some fixed quantity broken
into parts
To create a circle graph
• 1) Divide the data for each type by total
•   1st period = 21   21/138 =
•   2nd period = 17   17/138 =
•   3rd period = 29   29/138 =
•   4th period = 22   22/138 =
•   5th period = 22   22/138 =
•   6th period = 27   27/138 =

• Total students = 138

• 2) Multiply that fraction by 360o
• 21/138 * 360 = angle of the circle
Review
•   Where is the x axis?
•   Where is the y axis?
•   On what axis is time usually plotted?
•   Which is the independent variable?
•   Which is the dependent variable?

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 views: 9 posted: 4/2/2011 language: English pages: 11