CONTENTS 



EXKRCISK PAGE 



1 Does air occupy space ? 1 



2. Can air be made to exclude water ? 2 



3. Does air have weight ? 3 



3 A. Does air have weight ? 4 



4. How much does a cubic foot of air weigh ? 5 



5. Since air has weight, does it press downward as other heavy objects do ? 6 



6. Is air pressure the same in all directions ? 7 



7. To study the construction and operation of a mercurial barometer 8 



8. What effect is produced upon a volume of air by a change in its temperature ? 9 



8 A. What effect is produced upon a volume of air by a change in its temperature ? 10 



9. How are mercury thermometers used ? 11 



10. What is the relation between the Fahrenheit and centigrade thermometer scales ? 12 



10 A. To represent graphically the relation of centigrade and Fahrenheit scales 14 



11. Does the sun's position at noon change from day to day ? 15 



12. To determine the different areas covered by a beam of light striking the surface of the earth at 



different angles 16 



12 A. What are the different areas covered by a beam of light striking the surface of the earth at 



different angles ?. 17 



13. To make a chart which will show graphically the length of day and night at various times of 



the year 18 



14. What happens to water vapor when it comes in contact with a cold object ? 19 



15. What is the temperature at which the water vapor condenses in the room ? 20 



16. What is the relative humidity in the room ? . . . 21 



17. What is the relation between air pressure and wind ? 22 



18. In what direction does the air move around the center of a low-pressure area ? 23 



19. What effect does the rotation of a globe have upon the direction of motion of objects on its 



surface? 24 



20. Is air compressible ? 25 



21. Do gases mix with one another ? 26 



22. Will gases mix with one another if the lighter gas is placed above the heavier one ? . . . . 27 

 22 A. Do liquids diffuse ? 28 



23. Does a liquid fill all the space which it appears to fill ?. 29 



24. What are the parts of a flame ? 30 



25. Do the parts of the flame differ in heat ? 31 



26. Of what is the central part of the flame composed ? '32 



27. A product of the burning candle 33 



28. Is water a simple substance, or is it composed of more than one simple substance ? .... 34 

 2i>. What is the nature of oxygen the less abundant gas formed in the decomposition of water? 36 



30. What is the nature of hydrogen the more abundant gas formed in the decomposition of 



water? 38 



30 A. Can water be formed by burning hydrogen in oxygen ? 40 



31. What is the gas given off by a burning candle ? 41 



32. What is the com position. of carbon dioxide ? 42 



