HOW DO WE BREATHE? 



quickly and tightly. Immediately dip the glass tube into a glass 

 of water. As the steam cools, what condition results in the bottle? 

 Explain why the water rushes in and forms a fountain. 



A 



Voter.., flf- 



., ^balloon. 



air- 



4. What will happen when A blows through the tube? Explain 

 why. 



5. What will happen if one sucks air from the large bottle 

 through A? Explain reasons for two results which you can see. 



6. Make a booklet of clippings, " Air and Its Uses." Use 

 pictures and articles. 



SCIENCE CLUB ACTIVITIES 



1. ATMOSPHERIC PRESSURE AND VACUUM DEVICES 



Ask every club member to bring to the club meeting something 

 which uses vacuum or atmospheric pressure, or both, in its opera- 

 tion. He should be expected to demonstrate or explain to the 

 group just how his device works. 



2. GALILEO AND TORRICELLI 



Reports on the scientific works of these early scientists. 



3. FOUNTAINS: A GOOD WAY TO MAKE A FOUNTAIN 

 A. Gravity Pressure 



The tin can has a tight- fitting stopper with a tube passing through 

 it. This is joined by a rubber tube to the jet tube in the glass 



