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Activity Number 1 - A Demonstration
To illustrate the difference between visible and invisible air pollution.
- Clear glass bowl or large clear plastic glasses
- Tablespoon of milk
- Teaspoon of pepper
- spoon to stir with
If done as a demonstration, it may help to have a white piece of paper behind the bowl for easier observation.
- Fill bowl or cup half full of water.
- Add one tablespoon of milk to water, stir.
- Add teaspoon of pepper to water, stir.
- Observe the differences between the milk and pepper.
Ask before the experiment:
- What is the water a model of? (Air)
- What are the milk and pepper supposed to represent? (Milk is gaseous air pollution, pepper is particulate air pollution)
Ask after the experiment:
- What kind of pollutants did the the milk act like in the water? (Gases)
- What kind of pollutants did the pepper act like in the water? (Particulates)
- What would be easier to get out of the water? (Pepper)
- Would it be easier to remove gases or particulates out of the air? (In a controlled area, particulates can be removed by filtering the air. To remove gases from the air is more difficult.)
- How can we measure the gases in the air when we can't see them? (Air samples can be taken for a lab analysis, there are also monitors that can measure some gases like ozone in the air.)
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