. Laboratory exercises in elementary physics. ERCISE 11. BOYLES LAW. Preliminary.—We know that when pressure is exertedon a confined volume of gas its volume becomes less, andthat when the pressure is diminished the volume the following exercise we wish to see if we can find anyrelation between different pressures and the correspondingvolumes.* The apparatus used is shown in Fig. 96. A glass tube, ab,is bent as shown. The short arm is closed at the top, thelong arm open. The gas to beexperimented upon is confinedat b in the short arm by pour-ing mercury into the long press
. Laboratory exercises in elementary physics. ERCISE 11. BOYLES LAW. Preliminary.—We know that when pressure is exertedon a confined volume of gas its volume becomes less, andthat when the pressure is diminished the volume the following exercise we wish to see if we can find anyrelation between different pressures and the correspondingvolumes.* The apparatus used is shown in Fig. 96. A glass tube, ab,is bent as shown. The short arm is closed at the top, thelong arm open. The gas to beexperimented upon is confinedat b in the short arm by pour-ing mercury into the long pressures can be changedby using different depths ofmercury, the volume of gascan be read on the scale d, andthe depths of mercury on thescales d and e. The two cardsff help in reading the we know from the laws ofliquid pressure, the depth, ofmercury causing the pressurewill be the difference in theheights of the two columns;and since the atmospheric Ipressure is exerted on the topof the column in a, the total pressures will equal the. * Suggest a method for such an experiment. 186 DYNAMICS. height of mercury, causing the pressure plus the heightof the barometer, whose reading must be known. Sincechanges of temperature affect the volume, the tempera-ture must be practically uniform during the exercise. EXPERIMENT. Apparatus.—As shown (tube; support; scales; reading-cards);about 500 gr. mercury (clean and dry); barometer; feather and rodto remove air. Object.—To discover some relation between the volumeof a confined body of gas and the pressure exerted upon it. Manipulation.—Kead the barometer. (See the cardof instructions tacked over the instrument, with instruc-tions for reading vernier, etc.) The barometer reads ininches; as the other readings will be in centimeters, con-vert the barometer-reading to centimeters by the followingformula: , in inches _> , . w*7 = , m cm. Eead the thermometer. Place the glass funnel (be surethat it is clean and
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics
