CHAPTER IX. 

 MEASUREMENT OF DENSITY. 



18. DENSITY. 



i. (a) The mass of 1 c.c. of various bodies. 

 Determine, by measurement and calculation the 

 number of cubic centimetres in a wooden block. 

 Then find the mass of the block in grams. From 

 these results calculate the mass of one cubic centi- 

 metre. 



(6) Find the volume and mass of a number of 

 bodies, each made of different material ; say, lead, 

 brass, iron, cork and stone. If regular solids are 

 available the volume should be found by calcula- 

 tion from measurements. The volume of irregular 

 solids can be found by the method of displacement. 



ii. The mass of 1 c.c. of various liquids. Weigh 

 a small beaker, and into it run from a pipette 

 10 c.c. of water. Weigh again. Repeat with other 

 liquids ; such as Methylated spirit, Turpentine. 



Note. In using a pipette care should be taken 

 that the liquid is not drawn into the mouth. The 

 FIG. 35. How a pipette forefinger and not the thumb should be placed on 

 is used. the top (Fig. 35). Tabulate results. 



(c) Counterpoise a small beaker with lead shot. On the pan with the 

 shot place a 50 gm. weight. Run water into the beaker till a counterpoise 

 is again obtained. Note the difference in sizes of the water in the beaker 

 and the 50 gm. weight. Measure the water in a graduated cylinder, and 

 assuming that the weight is a cylinder, find its volume. 



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