74 LIVING IN AN OCEAN OF AIR 



2. John wishes to devise an apparatus to measure the air 

 capacity of his lungs. How can he make it? 



3. Gerald has his wind knocked out while playing football. 

 What are his team mates likely to do for him? Is this the most 

 effective remedy? 



4. Find out and explain why it is so difficult to remove the glass 

 cover on a jar of canned fruit. 



REPORTS UPON OUTSIDE THINGS I HAVE 

 READ, DONE, OR SEEN 



1. Report upon an article related to some topic discussed in this 

 unit. The article may be from a current number of a science 

 magazine or from some popular science book you have read. 



2. Galileo, an experimental scientist. 



3. Trips made by man into the stratosphere. 



4. Uses that boys and girls make of air. 



5. Rare gases of the atmosphere. 



SCIENCE RECREATION 



1. If the tube is inverted, what evidence will indicate that air 

 cu pi es Fpace? 

 2. What will happen when the clamp C is 



flp -__~wi~~ occupies 



____ Ctr" 



opened? Explain why. 



t JiMffl (MHW\\T\>CZX<^nt'H~ ^fcw_ *. 



-deflated: 



balloon 



3. MAKE A FOUNTAIN-IN- VACUUM 



Procure an 8-oz. bottle, a 1-hole stopper to fit it, and a glass tube 

 12 inches long. Soften the glass tube in the middle in the flame. 

 Draw it out to a fine thread. Break off the fine thread so there 

 is only a small opening leading out of the glass tube. These tubes 

 are called jet tubes. Wet one of the tubes and place it in the 

 stopper, so that a jet end (small opening) will be inside. Never 

 push a glass tube into a stopper when the stopper is in the bottle. 

 Hold the bottle in a towel over the nose of a steaming teakettle 

 for a few minutes. WJien the steam has driver; the ajr out. cork 



