822 EXPERIMENTS ON SPECIFIC HEAT. 



removing loose bits of ^ce and the collected water, 

 98 gr of water, which has been heated until it nearly 

 boils, is poured into the hole, and stirred with the 

 thermometer, until the temperature has fallen to 0. 

 The water is then removed by a pipette, and its volume 

 will be found to be about 220 OC '5, so that the original 

 quantity poured in has increased by 220*5 98 = 122 CC *5. 

 These quantities can of course only be given approxi- 

 mately, 011 account of the sources of error mentioned 

 previously. 



The result of the experiment would thus be that 98^ of 

 lead, in cooling from 100 to 0, have given up a quantity 

 of heat sufficient to melt 3^*75 of ice, while the same 

 weight of water, when cooled through the same range 

 of temperature, gave up heat sufficient to melt 122 gr *5 

 of ice. The quantities of heat given up by the water 

 and lead when cooled through the same number of 

 degrees are thus in the proportion of 122 '5 : 3*75, and 

 the same quantities of heat would be required to raise 

 water and lead respectively from to 100 ; hence, 

 since the specific heat of water is = 1, we have the 

 proportion 



122.5:3-75 i:# 



<fc = specific heat of lead=O03. 



It has been already mentioned in connection with the 

 determination of the fixed points of the thermometer 

 scale, that during the melting of ice, and during the 

 boiling of water, the temperature remains stationary, 

 although quantities of heat are continually being taken 

 up both by ice while it is converted into water and 

 by water when it is converted into steam. The heat 

 taken .up by ice at while it is becoming water at is 

 expended in melting the ice; the heat applied to boil- 



