Experiments and Exercises 



PAGE 



Effect of Atmospheric Pressure on a Barometer 40 



Air Under Pressure 40 



The Siphon 40 



Elasticity of Air 41 



Air and Combustion 41 



Principle of Air Pressure Illustrated by the Medicine Dropper . 41 



Composition of Water 45 



Change in Temperature of Water 46 



Pressure of Falling Water 49 



Dissolving Property of Water 51 



Capillarity 51 



Water Seeks Its Own Level 51 



Principle of One Type of Water Supply System 52 



Distillation of Water 61 



Softening of Hard Water . 62 



Preparation of Soap 63 



Water Pressure 69 



Measurement and Increase of Water Pressure on Surfaces . . 70 



Relation between Depth and Water Pressure 70 



Requirements for Combustion 84 



Relation between Heat and Temperature 84 



Variation in Kindling Temperature 84 



Fixed Points of a Thermometer 87 



Heat Expands Solids 88 



Heat Expands Liquids 88 



Heat Expands Gases 88 



Structure and Use of a Fire Extinguisher 95 



Transference of Heat by Radiation 103 



Circulation of Water by Convection Currents 103 



Expansion of Air When Heated 103 



Transference of Heat by Convection 104 



Transference of Heat by Conduction 104 



Ventilation of a Room 113 



Condensation of Water Vapor 122 



Measurement of Relative Humidity 124 



Measurement of Rainfall 124 



Construction of Weather Graphs 143 



Construction of Weather Maps 143 



Yearly Motions of the Earth and Its Moon 151 



Causes of the Seasons . 156 



