The book Science for the School And Family was written by author Worthington Hooker Here you can read free online of Science for the School And Family book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Science for the School And Family a good or bad book?
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In all these cases the presence of the air can be made manifest by taking off the pressure of the surrounding air, and thus allowing the air in these substances to expand. If an egg be placed in a' jar of water, Fig. 107, under the receiver of an air-pump, on exhaustion being made air-bubbles will constant- ly rise in the water from the egg. So, too, a glass of porter, Fig. 108, will have its surface covered with foam, the carbonic acid gas in it escaping freely when the pressure of the air upo...n it is taken off. The same thing may be seen to some extent even in water, for it always con- tains some air. For the same reason a shriv- eled apple, with the pressure of the air taken from it, will become plump and fair, "but will Fig. 108. ghrink at once to its shriveled state when the air is admitted into the receiver. Fig. 107. PNEUMATICS. 121 161. Elasticity of the Air. — All the phenomena cited in § 158, § 159, and § 160 exhibit the elasticity of the air. It is from this property that it is always disposed to ex- pand.
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