. The principles of physics. ATMOSPHEEIC PRESSURE. 155 15. A (Fig. 121) represents a stand-pipe for furnishing the neighboringdistrict with water by the action of gravity. The stand-pipe is suppliedwith water from a lake In the vicinity by means of a pumping Fig. 121. Vertical distances are represented on a scale of i in. =o= 50 ft. If thestand-pipe be filled to the level mn and the water be at rest in themain pipe leading from it, what pressure will the pipe sustain at pointsa, c, and d respectively ? Section II. ATMOSPHERIC PRESSUEE. 129. Introduction. — We live at the bottom of an
. The principles of physics. ATMOSPHEEIC PRESSURE. 155 15. A (Fig. 121) represents a stand-pipe for furnishing the neighboringdistrict with water by the action of gravity. The stand-pipe is suppliedwith water from a lake In the vicinity by means of a pumping Fig. 121. Vertical distances are represented on a scale of i in. =o= 50 ft. If thestand-pipe be filled to the level mn and the water be at rest in themain pipe leading from it, what pressure will the pipe sustain at pointsa, c, and d respectively ? Section II. ATMOSPHERIC PRESSUEE. 129. Introduction. — We live at the bottom of an exceed-ingly rare and elastic aerial ocean, called the atmosphere,extending to an undetermined distance into space. Everymolecule in the gaseous ocean is drawn towards the earthscenter by gravitation and the atmosphere is thus bound to theearth by this force, just as is the liquid ocean. Evidently thepressure in the atmosphere due to its weight increases withthe depth; or, since in our position we are more accustomedto speak of hifffit in the atmosphere, decreases with the pressure does not diminish regularly with the hight asin an ocean of incompressible fluid. Air is very compressibleand therefore varies in density. The lower strata of airsustai
Size: 2225px × 1123px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1895
