6.2D Tables and Graphs
Line graphs can be used to show how something changes over time. Line graphs can also be used to show trends in data and can be useful to predict what will happen next. Line graphs are very often used in science!
Circle or Pie Graph
Circle graphs are best to use when you are trying to compare parts of a whole. Each section of a circle graph represents a percentage out of 100%. They do not show changes over time
Bar graphs can be used to compare different groups. Bar graphs show comparisons between amounts or events and are useful in making generalizations about data.
Parts of a Graph
The Legend – The legend tells what each bar, line, or section represents on the graph. Just like the legend on a map, the legend for a graph should help the reader understand the information they are looking at.
X and Y Axis
X and Y Axis – Bar graphs and line graphs have an x-axis and a y-axis. In most graphs, the x-axis is horizontal (flat) and the y-axis is vertical (up and down). The x-axis shows what is being measured or compared. The y-axis is typically numbers showing the amounts for what is being measured. Both the X and Y axis should be clearly labeled to help the reader understand the information shown by the graph.
The Data – The most important part of a graph is the information or data that it contains. The bars, lines, or sections on a graph must accurately portray the information that is shown on the graph. Neatness and accuracy are key!
Think Central Digital Lesson
Click link below for measurement lessonhttp://www-k6.thinkcentral.com/content/hsp/science/fusion/common/dlo_player/digital_lessons/tx/G6_NC_187029/index.html?type=teacher&grade=6
Measuring Liquid Volume
- Use a beaker or graduated cylinder
- To prevent spills and messes - DO NOT fill the graduated cylinder with water directly from the faucet
- Pour water from a beaker into the graduated cylinder, then use a pipette if needed
- Always read the measurement at eye level
- By lowering your head toward the container
- Read the measurement from the bottom of the meniscus
- The meniscus is the curve in the surface of the liquid due to the attraction of the liquid to the container
Water Displacement Method
- For ‘irregularly-shaped' objects that are solid but cannot be measured with a ruler and formula
- Examples: nail, rock
- First record an initial volume of water in the graduated cylinder
- There must be enough water to cover object that you are measuring, but not too much to overflow when adding the object
- Next carefully add the object to be measured into the cylinder
- Slide the object in - don't just drop it!
- Then measure and record the final volume - the amount of the water with the object
- Final Volume – Initial Volume = Volume of the Object