Thermometer, Fahrenheit's, [277]
Tides, [78]
Tubes, friction of liquids in, [197]
Twilight explained, [346]
Unison, [268]
Up and down, explanation of, [81]
Vapor, influence of pressure upon the formation of, [292]
Vaporization, [291]
Velocity, relation of, to force, [194]
Velocity, relation of, to shape, [195]