3.(Pg. [136]) In what particular do elastic, differ from non-elastic, fluids?
4.(Pg. [136]) What is meant by the elasticity of air?
5.(Pg. [137]) What is said respecting the weight of the atmosphere?
6.(Pg. [137]) Why do we not feel the pressure of the air?
7.(Pg. [137]) What would be the effect of relieving us from atmospheric pressure?
8.(Pg. [138]) How may the weight of the air be shown by the aid of the air pump, and a piece of bladder?
9.(Pg. [138]) How is this explained?
10.(Pg. [138]) How may its elasticity be exhibited, by an apple, and by a bladder?
11.(Pg. [139]) What is the absolute weight of a given column of atmospheric air, and how could its whole pressure upon the earth be ascertained?
12.(Pg. [139]) How can the weight of a small bulk of air be found?