The puffer is a great way to demonstrate air pressure. The sealed bag traps air inside it and when you press on it, air puffs out of the straw. Today, we are going to test how far our puffer will move different objects and measure the distance each object will travel.
Jelly Bean and Jumping Bean predicted which object would move further using our puffer. They then placed all the objects in order from predicted shortest distance to the longest distance.
Then the fun begins- slamming down on the baggie. The girls loved hearing the puff of air shoot out of the straw.
Jelly Bean and Jumping Bean helped each other measure the distance each object moved and recorded each one on a post-it note.
After all the objects were tested, the girls looked at the numbers on the sheets of paper and ordered them from smallest to largest.
And, the results! The objects that moved the furthest were the light objects - some were even hollow. We looked at the rubber ball and discussed that it is heavier than the others. We also reviewed what we learned about density from our Float-Sink activities and determined the rubber ball did not move because it is was heavier due to its greater density. The pony bead was more flat, and the air passed over it, therefore, it did not move.
- plastic baggie
- 2 sponges
- objects to puff- we used a pony bead, plastic ball, rubber ball, Easter egg, and pompom
- tape measure
- Make the puffer by placing a straw between two sponges and putting them into a plastic baggie.
- Tape the baggie shut so it does not open during the activity.
- One at a time, place an object about one inch in front of the straw.
- Press down on the sponges in the baggie.
- Measure the distance the object travelled.
- Record the distance on a sheet of paper.
- Order the distances from smallest to largest.