CONTENTS. Vll 



ABT. PAGE 



56. The Pressure of a Mixture of Gases 106 



57. Mixture of Equal Volumes of Gases 107 



58. Mixture of Unequal Volumes of Gases 108 



59. Vapors, Gases 108 



60. Formation of Vapor, Saturation 109 



61. Volume of Atmospheric Air without its Vapor 110 



62. Change of Volume and Temperature 110 



63. Formation of Dew the Dew Point 112 



64. Pressure of Vapor in the Air 112 



65. Effect of Compression or Dilatation on Temperature 113 



66. Expansion of Bodies Maximum Density of Water 113 



67. Thermal Capacity Unit of Heat Specific Heat 115 



68. Specific Heat at a Constant Pressure, and at a Constant 



Volume 116 



69. Sudden Compression of a Mass of Air 118 



70. Mass of the Earth's Atmosphere 120 



71. The Height of the Homogeneous Atmosphere 120 



72. Necessary Limit to the Height of the Atmosphere 121 



73. Decrease of Density of the Atmosphere 122 



74. Heights Determined by the Barometer 124 



Table of Specific Gravities 130 



Examples 131 



PART II. 



HYDROKINETICS. 



CHAPTEE I. 



MOTION OF LIQUIDS EFFLUX RESISTANCE AND WORK OF 

 LIQUIDS. 



75. Velocity of a Liquid in Pipes 136 



76. Velocity of Efflux 137 



77. The Horizontal Range 140 



78. Time of Discharge when the Height is Constant 141 



