132 



GENERAL SCIENCE 



TABLE OF MELTING POINTS 



Temperature 

 Centigrade. 



Temperature 

 Fahrenheit. 



Alcohol -130 



Mercury -38.8 



Ice 



Butter '. 33 



Lard 33 



Paraffin 38-52 



Fusible metals , . . 70 



Sulphur 114 



Solder 190 



Tin : 232 



Lead 328 



Zinc 419 



Aluminum. . 655 



Silver 955 



Gold 1060 



Copper 1068 



Iron 1100 



Platinum 1730 



Tungsten 2800 



Tantalum . . 2300 



32 



91.4 



6072 

 4172 



Alloys are usually made of two or more metals. The chief 

 use of an alloy is for soldering. Lead pipes are mended by an alloy 

 made of one-half tin and one-half lead. The melting point of this 

 solder is 374 F., while the melting point of lead is 682 F. 



An alloy mixture of bismuth, 7 parts, lead, 4 parts, tin, 2 parts, 

 and cadmium, 1 part, melts at a temperature of 158 F. A teaspoon 

 made from this alloy would melt in a very hot cup of coffee. 



Automatic fire sprinklers use an alloy which melts at a low 

 temperature. Pipes near the ceiling of the rooms in many buildings 

 are fitted with automatic fire sprinklers as a protection against fire. 

 The heat of the fire melts a plug and allows the water to be forced 

 out into the room. 



Plugs for boilers and electric fuses are made of alloys which 

 melt easily. 



