THE PROPERTIES OF MATTER. 



very brittle ; it is very elastic, but very brittle also. Steel is far 

 more tenacious than lead, and far more brittle. 



50. What is Malleability t Malleability is 

 that property of matter ~by virtue of ivhich some 

 bodies may be rolled or hammered into sheets. 



(a.} Steel lias been rolled into sheets thinner than the paper upon 

 which these words are printed. Gold is the most malleable metal, 

 and, in the form of gold leaf, has been beaten so thin that 282,000 

 sheets, placed one upon the other, would measure but a single inch 

 in height. 



51. What is Ductility ? Ductility is that 

 property of matter by virtue of which some bodies 

 may be drawn into wire. 



(a.) Platinum wire has been made ^m f an mc ^ * n diameter. 

 Glass, when heated to redness, is very ductile. 



52. Experiment. Heat the middle of a piece of 

 glass tubing, about six inches long, in an alcohol flame, 

 until red-hot Roll the ends of the glass slowly between 

 the fingers, and when the heated part is soft, quickly draw 

 the ends asunder. That the fine glass wire thus produced 

 is still a tube, may be shown by blowing through it into a 

 glass of water, and noticing the bubbles that will rise to 

 the surface. 



Recapitulation. To be reproduced and amplified 

 by the pupil from memory. 



PROPERTIES 

 OF MATTER. 



CHEMICAL. 



PHYSICAL. 



GENERAL... 



CHARACTER- f ADHESION ' 

 ISTIC. 1 COHESION. 



Extension, Impenetrabil- 

 ity, Weight, Indestruc- 

 tibility, Inertia, Mobil- 

 ity, Divisibility, Po- 

 rosity, Compressibility, 

 Expansibility, Elas- 

 ticity. 



Hardness. 



Tenacity. 



Brittleness. 



Malleability. 



Ductility. 



