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# Variables

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### Transcript

• 1. Review
Warmup.
What is a variable?
Where is there more oxygen, a lot of photosynthesis or a little.
• 2. A variable is any factor of an experiment that can be changed.
What Kind of plant
Water
Bags
Light
Amount of Co2
Variable
• 3. Three types of variables
Control- What stays the same
Manipulated_What you change before the experiment.
Responding_The variable that is observed or measured.
• 4. What batter is the best?
Put them in flashlights
Turn on the flashlights
Record how long each
Flashlight stays on.
Battery experiment
• 5. Battery Experiment
Manipulated Variable
Batteries
Responding Variable (dependent variable)
Length light stays on.
Control variable
Same flashlight
Same time started
Same temperature
• 6. Experiment 2
What kind of coffee cup keeps coffee warmest.
Look for
Manipulated variable
Control variables
Responding variable
• 7. experiment
• 8. Manipulated Variables
What was the manipulated variable?
These are the variables you set up. What is different in the experiment
• 9. Responding variables
What was the responding variable.
The responding variable is what you observe.
We observed the change in
Temperature
• 10. Control variable
What parts of the experiment were kept the same.
Always use the same measuring
devices.
Same thermometer
Same amount of water
Same beginning temperature.
• 11. Amount of variables
How many manipulated variables can we have?
How come we can only have one?
What happens if we had different batteries AND different flashlights, AND different temperatures they were tested in?
Do we know which battery is truly better?
Could have better flashlight
Temperatures can make batteries last longer.
YOU CAN ONLY HAVE ONE MANIPULATED VARIABLE AT A TIME.
This is so you know what exactly is causing the dependent variable.
• 12. Elodea experiment.
• 13. You will do three experiments.
For each experiment give:
Hypothesis: What do you expect will give you the most photosynthesis?
Manipulated Variable: Which Variable are you testing
Control Variable: What variables are you keeping the
same?
Responding Variable: Bubbles

Data table,
Do 4 tests with 4 different variables and record your data.
Conclusion
How does this variable affect photosynthesis?,
• 14. Elodea experiment.
• 15. Predictions? Hypothesis
What color will work best?
PlainRed Green Blue,
What will happen when we increase CO2
What will happen when we increase the light level?
• 16. Our Lab
You will record Data Table.
Change only one variable at a time. You then know this effect on the photosynthesis.
You will do 4 runs for each variable.
Test the effect of Light Level
Test the effect of light color
Test the effect of carbon dioxide
• 17. Results