A text-book on chemistryFor the use of schools and colleges . nsist are not in contact,but are separated by interstices, orintervals. The distance by whichthey are separated admits ofchange by external agents. If, forexample, a metallic ball, Fig. 1, beso adjusted to a ring that, whencold, it will just pass through it,on subjecting the ball to heat itwill be found to have dilated, andwill no longer pass through, butwill remain sustained. On allow-ing it to cool in that position, itcontracts again to its former size,and will fall through the ring spon-taneously. The heat has in thiscase partial
A text-book on chemistryFor the use of schools and colleges . nsist are not in contact,but are separated by interstices, orintervals. The distance by whichthey are separated admits ofchange by external agents. If, forexample, a metallic ball, Fig. 1, beso adjusted to a ring that, whencold, it will just pass through it,on subjecting the ball to heat itwill be found to have dilated, andwill no longer pass through, butwill remain sustained. On allow-ing it to cool in that position, itcontracts again to its former size,and will fall through the ring spon-taneously. The heat has in thiscase partially overcome the mutu-al attraction of the atoms composing the metal; theyhave receded from one another, and an enlargement isthe result. As the heat in the latter part of the exper-iment radiates away, cohesion again draws the atomstogether to their original distance. What does the atomic theory affirm ? What is the weight of anatom of hydrogen ? of oxygen ? of water ? How are atoms sepa-rated? Describe the apparatus Fig. 1. What was the effect of theheat ?. HISTORY OF
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Keywords: ., bookcentury1800, bookde, booksubjectchemistry, booksubjectphysics
