A Manual of Natural Philosophy : Compiled From Various Sources, And Designed for Use As a Text-Book in High Schools And Academies
The book A Manual of Natural Philosophy : Compiled From Various Sources, And Designed for Use As a Text-Book in High Schools And Academies was written by author Johnston, John, 1806-1879 Here you can read free online of A Manual of Natural Philosophy : Compiled From Various Sources, And Designed for Use As a Text-Book in High Schools And Academies book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Manual of Natural Philosophy : Compiled From Various Sources, And Designed for Use As a Text-Book in High Schools And Academies a good or bad book?
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If the atmosphere was of uniform density at all distances above the surface, this fall of the mercury would necessarily be proportional to the height ; that is, if an ascent of 100 feet above the level of the sea produced a fall of yVth of an inch, then on ascending 200 feet it would fall y\ths of an inch, and so on for any other height.- But this is by no means the case ; it is found by experiment that the mercury falls much more rapidly while ascending the first hundred feet, than it does in ...passing through the second ; and more the carried before it is affecfed ? Can a column of water be raised 34 feet above the surface on a iiigh mouutain 1 What is the reason 1 Will the mercury in the barometer de- scend equally for every ascent of 100 feet ? 227. What is the height of the mercury in the barometer 3 miles above the surface of the earth 1 What would be its height 15 nifle3««.&. *he surfaced 142 NATURAL PHILOSOPHY. second hundred feet than in the third, and so on. Tliis is in consequence of the density of the air diminishing, as we ascend from the surface, by reason of the diminished pressure (210.) The stratum of air at the surface is pressed by the whole weight of the superincumbent at- mosphere ; but, as we ascend above this, the quantity of the superincumbent fluid being less, the pressure will be less, and also the density.
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