Air Pressure Investigation #2 Space Bag Articulating a Vision of Effective Science Instruction

Purpose To engage in the practices of science to deepen understanding of effective science instruction

Function as a community of learners Investigate air pressure phenomena as adult learners to deepen knowledge of science teaching and learning Apply the Air Puppies Model to explain two air pressure demonstrations What we are going to do

Think about the Air Puppies model – 2 rooms and a frictionless movable wall Think about your investigation of the balloon in the bottle using the Air Puppies model to construct explanations for your observations How did the model help you understand what you observed in the activity? Reflection

New Air Pressure Investigations 1.Two demonstration videos 2.Predict what you think will happen based on your prior knowledge about the Air Puppies model 3.Use the model to explain the observations in each demonstration 4.Identify similarities and differences in the two demonstrations

Air Pressure Model Review 1.“Air Puppies” represent molecules of gas 2.Just as puppies move randomly and quickly often bumping into walls and each other, so do gas molecules 3.Two rooms with Air Puppies are divided by a frictionless, movable wall 4.In each room, Air Puppies move freely and bump into all 4 walls of the room

Air Pressure Model Review

Air Pressure Phenomenon: The “Space Bag” The setup will be shown first, then paused to let you predict the outcome Materials include: A commercial vacuum storage bag known as a “space bag” A comforter inside the space bag A vacuum cleaner with hose

Air Pressure Phenomenon: The “Space Bag”

In your journal Predict what you think will happen as the vacuum cleaner hose remains attached to the Space Bag Note why you think that will happen How can the Air Puppies model help you make a prediction? Air Pressure Phenomenon: The “Space Bag”

Air Pressure Phenomenon: The “Space Bag” – Action

Developing an Explanation for the Space Bag Demo With a partner, develop an explanation using the Air Puppies Model Write your explanations in your journal Draw Air Puppy diagrams that represent the situation a) before the vacuum was turned on and b) after the vacuum was removed Identify the movable wall and the two rooms it separates

What do the two rooms represent? The space inside the bag and the atmosphere outside the bag What represents the movable wall? The plastic bag itself Developing an Explanation for the Space Bag Demo

How can the Air Puppies model be modified to include the vacuum cleaner and hose? The vacuum cleaner can be represented by a pump that moves air puppies from one room [in the bag] into the other room [the atmosphere outside] Developing an Explanation for the Space Bag Demo

Modified diagram: (Before vacuum cleaner is turned on)

Developing an Explanation for the Space Bag Demo Modified diagram: (Vacuum cleaner is turned on)

Air Pressure Phenomenon: The “Human Shrink Wrap” The setup will be shown first, then paused to let you predict the outcome Materials include: A person A large “human size” plastic bag A vacuum cleaner with hose

Air Pressure Phenomenon: The “Human Shrink Wrap” - Setup

In your journal Predict what you think will happen as the vacuum cleaner hose remains attached to the Shrink Wrap Note why you think that will happen How can you use the Air Puppies model to help you make a prediction? Air Pressure Phenomenon: The “Human Shrink Wrap”

Air Pressure Phenomenon: The “Human Shrink Wrap” - Action

Developing an Explanation for the Human Shrink Wrap Demo With a partner, develop an explanation using the Air Puppies Model and record in your journal Draw Air Puppies diagrams that represent the situation a) before the vacuum was turned on and b) after the vacuum was removed Identify similarities and differences between the Space Bag and Shrink Wrap demos

Developing an Explanation for the Human Shrink Wrap Demo What do the two rooms represent? The space inside the bag and the atmosphere outside the bag What represents the movable wall? The plastic bag itself

How can the Air Puppies model be modified to include the vacuum cleaner and hose? The vacuum cleaner can be represented by a pump that moves air puppies from one room [in the bag] into the other room [the atmosphere outside] Developing an Explanation for the Human Shrink Wrap Demo

Modified diagram: (Before vacuum cleaner is turned on) Developing an Explanation for the Human Shrink Wrap Demo

Modified diagram: (After vacuum cleaner is turned off) Developing an Explanation for the Human Shrink Wrap Demo

Similarities & Differences Between Air Pressure Demos SimilaritiesDifferences Two rooms - inside the bag and the atmosphere outside Comforter is porous with air between fibers that can be removed. Human is solid and can’t be compressed. Movable walls are the plastic bags No one-way valve on shrink- wrap bag, so air re-enters bag after vacuum is turned off

Similarities & Differences Between Air Pressure Demos SimilaritiesDifferences Vacuum cleaners are the pumps that move air particles (puppies) from one room to the other room The two rooms have different sizes Neither comforter nor human can be moved inside the bag

What Makes Science Instruction Effective? Part IV (cont.) Analyzing Science Teaching and Learning