21. 〃 The Measuring of Weights. The Balance 29

22. 〃 The Weight of the same Bulk or Volume of Water is

Constant under the same conditions. Mass. Density 30

23. 〃 Equal Volumes of Different Things under the same

circumstances, have Different Weights: the Density

of Different Bodies is Different 32

Science Primers, Introductory · 第 24 / 86 题