CONTENTS 



LABORATORY EXERCISES 



EXERCISE PAGE 



1 . Air Takes Up Room 1 



2. How to Measure Length and Area 3 



3. The Measuring of Volume and Capacity 4 



4. How to Weigh 5 



5. Plumb Line and Pendulum 7 



6. Inertia and Centrifugal Force 9 



7. Adhesion of Liquids to Solids; Liquid Surfaces 10 



8. Capillary Action 12 



9. Density 13 



10. Weight of a Stone in Air and in Water 14 



1 1 . Center of Mass 15 



12. Pressure of the Atmosphere 16 



13. Pressure of Water and of Air 17 



14. Collecting a Gas Over Water 18 



15. Substances Produced in Breathing and Burning 19 



16. Heating of Tin in Air 20 



17. Preparing Oxygen 21 



18. Air Dissolves in Water , 22 



19. Nitrogen; the Composition of Air 23 



20. Expansion and Contraction of Water 24 



21. Expansion and Contraction of Air 25 



22. Melting Point and Freezing Point; A Freezing Mixture. ... 26 



23. Boiling Points of Water and Alcohol 27 



24. Conduction of Heat 27 



25. Convection 28 



26. Is Heat Used Up When a Liquid is Changed to a Gas? 29 



27. Kindling Temperature 30 



28. Mixing Materials of Different Temperatures 30 



29. Contents of Natural Water 31 



iii 



