21.(Pg. [123]) How by the apparatus represented at [fig. 6, plate 13]?
22.(Pg. [123]) What is meant by the specific gravity of a body?
23.(Pg. [123]) What do we in common mean by calling a body heavy, or light?
24.(Pg. [124]) Why would not the metals answer to compare other bodies with?
25.(Pg. [124]) What must be supposed equal in estimating the specific gravity of a body?
26.(Pg. [124]) What has been adopted as a standard for comparison?
27.(Pg. [125]) What is the first step in ascertaining the specific gravity of a solid?
28.(Pg. [125]) What quantity of water will the solid displace?
29.(Pg. [125]) Why will a solid weigh less in water than in air, and to what will the loss of weight be equal?
30.(Pg. [126]) What is the arrangement represented by [fig. 7, plate 13]?