METALS. 



METALS. 



803 



Messrs. Petit and Dulong have determined with great care the 

 calorific capacity of a great number of metals for 1 of the centigrade 

 thermometer, that of water being taken as unity. Their results i 



Bismuth . 0-0288 



Lead 

 Gold . 

 Platinum 

 Mercury 

 Tin 

 SUver 

 Zinc 



Tellurium 

 Copper . 

 Iron . 

 Nickel . 

 Cobalt 



0-08M 



o-owa 



0*0314 

 0-OMO 

 0-0516 

 0-OM7 

 0*0927 

 0*0912 

 (HWM 

 o-iooo 



01088 

 0-1498 



Mem. Petit and Dulong deduce from their experiments the 

 important conclusions that the atoms of all substances have the some 



which may be exposed to the most intense heat of a wind-furnace 



without being at all vaporised. 



Beoquerel has given the following table of the relative conducting 



powers of the metals for electricity, the wires of the several metals 



being of equal diameter : 



Copper . . . . ' . . . 100*00 



Gold 93*60 



Silver 73-60 



Zinc 28-50 



Platinum 16*40 



Iron IS'80 



Tin 15-50 



Lead 8-30 



Mercury 3*45 



Potassium 1'33 



According to Pouillet, each of the following metals is positive with 



relation to that which follows it: zinc, lead, tin, iron, antimony, 



bismuth, copper, mercury, silver, gold, tellurium, palladium, platina. 



