SI Units

1
Chapter 2-2
2
SI Units

• SI stands for International System of measurement
• We know it as the metric system.
• SI Units for Length is the meter
• Volume is cubic meter.
• Mass kilogram
• Temperature degrees Kelvin
• Time - seconds

3
Mass vs. weight

• Mass of an object measures the amount of matter
  in an object.
• Weight the downward pull of gravity on an
  object.
• Mass and weight are not the same thing.
• Weight changes when gravity changes.

4
Boiling and Freezing Points

• Celsius boiling is 100 degrees, freezing 0
  degrees
• Kelvin boiling is 373 degrees, freezing is -273
  degrees
• Absolute Zero - 0 degrees Kelvin, -273 degrees
  Celsius.

5
Chapter 2-3

• Communicating Data
• Scientific Illustrations
• Photographs can show an object exactly as it is.
• Drawings a sketch that shows what an object
  looks like or helps model it.

6
Tables and Graphs

• Table displays information in rows and columns
  so that it is easier to read and understand.
• Graph is used to collect, organize, and
  summarize data in a visual way.

7
Types of Graphs

• Line, Bar, and Circle.
• They are the same because they all visually
  represent data that have been collected.
• They are different because each represents
  different kinds of data.

8
Types of Graphs continued

• Line Graph is used to show the relationship
  between two variables. Shows changes of data
  over periods of time.
• Bar Graph uses bars to show the relationship
  between variables. Compares Data.
• Circle Graph shows the parts of a whole.

9
Misleading Graphs

• Misleading graphs sometimes do not start with a
  zero, sometimes the graph is not broken when it
  is needed, intervals go in random orders not in a
  pattern, spaces between lines are not equal, and
  the sizes of bars are not the same.