A text-book of physics, largely experimentalOn the Harvard college "Descriptive list of elementary physical experiments." . ch at theneck, dip one or two centimetersbeneath the surface of cold waterin a tumbler. The stopper at thetop of the flask should fit tube leading through thisstopper should dip two or threecentimeters beneath the surfaceof the water and should be openat the top. Apply a flame to the bottom ofthe flask, taking care not to let itrise higher than the water, andwatch what occurs in the flask andin the tumbler as the temperatureof the water rises. Two kinds of bubbl
A text-book of physics, largely experimentalOn the Harvard college "Descriptive list of elementary physical experiments." . ch at theneck, dip one or two centimetersbeneath the surface of cold waterin a tumbler. The stopper at thetop of the flask should fit tube leading through thisstopper should dip two or threecentimeters beneath the surfaceof the water and should be openat the top. Apply a flame to the bottom ofthe flask, taking care not to let itrise higher than the water, andwatch what occurs in the flask andin the tumbler as the temperatureof the water rises. Two kinds of bubbles may be looked for in the vessels: bubblesof air, which will not disappear till they reach the surface of thewater and burst; bubbles of water vapor, which may rise to thesurface if the water is hot, but will burst and disappear with con-siderable noise when they come into contact with colder water. upper layers of water in the flask will be colder than the lower launtil the whole becomes violently stirred up by actual boiling. Do any bubbles rise at first in the flask? If so, do they appear tobe air or to be vapor?. FIG. 193. 356 PHYSICS. Do any bubbles flow over into the tumbler at first? If so, arethey air or vapor? As the process continues, do the appearance and behavior of thebubbles in either vessel change? If so, what is the nature of thechange? What is the action in each vessel after boiling begins? After boiling has continued for a minute or two, remove the flameand watch what happens, particularly in the tubes of the apparatus. Does the water from the tumbler rise in the side tube? If so, doesit flow over into the flask? Can you explain the observed actions? Before these actions cease, place one finger for a moment on themouth of the tube at the top of the flask, watching the water in theside tube at the same time. Does anything happen in the sidetube? * If so, can you explain it? Again boil the water in the flask, close the rubber tube at the topby means of the pin
Size: 1288px × 1940px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics
