CHAPTER X. 



PRINCIPLE OF ARCHIMEDES. 



22. LOSS OF WEIGHT OF BODIES IMMERSED 

 IN LIQUIDS. 



i. Loss of weight of a body immersed in water. Suspend a brick from a 

 spring balance and note the weight of it. Immerse the brick in a pail of 

 water, and again note its weight. 



(a) Using a more sensitive spring balance, 

 repeat this experiment with a large glass 

 stopper, and again with a smaller stopper. The 

 bodies lose in weight, and the amount of loss 

 depends on the size of the bod}'. 



ii. Repeat the experiment with the stoppers, 

 using (a) Brine, (6) Methylated spirit. The loss 

 of weight in spirit is less than the loss for the 

 same body in water. The loss is greater when 

 the body is weighed in brine than when weighed 

 in water. 



iii. Accurate determination of loss of weight of 

 a body immersed in water. Place a platform or 

 bridge across one pan of the balance, as shown in 

 Fig. 41. Suspend by means of a piece of thread 

 a cube or cylinder of metal, letting it han.L' in 

 an empty beaker, standing on the bridge, H, H, 

 Fig. 41. Find the weight of the object. Then 

 pour water into the beaker, and find the weight 

 of the object when immersed in water. .Make 

 certain that there are no bubbles of air adhering 

 to the object, before weighing in water. Find 

 accurately by measurement and calculation the 

 volume of the object. Repeat the experiment, 

 Fio.40.-The block weighs "ring liquids of which the density has already 

 less when immersed in water been found, instead ot water. 

 than when suspended in air. Tabulate the results. 



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