. The Ontario high school physics. ir, he hit upon a method of in-vestigation which confirmed the hypothesis hehad made, that the volume of a given quantityof air varies in-versely as the pres-sure to which itis subjected. Hetook a U-tube ofthe form shown inFig. 144, and bypouring in enough (,mercury to fill thebent portion, in-closed a definiteportion of air inthe closed shorterarm. By manipu-lating the tube headjusted the mercury so as to stand at the same height ineach arm. Under these conditions the imprisoned air was atthe pressure of the outside atmosphere, which at the time ofthe experi
. The Ontario high school physics. ir, he hit upon a method of in-vestigation which confirmed the hypothesis hehad made, that the volume of a given quantityof air varies in-versely as the pres-sure to which itis subjected. Hetook a U-tube ofthe form shown inFig. 144, and bypouring in enough (,mercury to fill thebent portion, in-closed a definiteportion of air inthe closed shorterarm. By manipu-lating the tube headjusted the mercury so as to stand at the same height ineach arm. Under these conditions the imprisoned air was atthe pressure of the outside atmosphere, which at the time ofthe experiment would support a column of mercury about 29inches high. He then poured mercury into the open armuntil the air in the closed arm was compressed intoone-half its volume. We observed, he says, not withoutdelight and satisfaction, that the quicksilver in that longerpart of the tube was 29 inches higher than the difierence in level gave the excess of pressure of theinclosed air over that of the outside atmosphere. It was. Fig. 144.—Boolesapparatus. ROBKRT BOTIK (1C27-1691). PublUlied liisLaw in 1662. One of the earliest of En^lishscientists basing their investigations uponexperiment. RELATION BETWEEN VOLUME AND PRESSURE OF AIR 115 clear to him, therefore, that the pressure sustained by theinclosed air was doubled when the volume was reduced to one-half. Continuing his experiment, he showed, on using a greatvariety of volumes and their corresponding pressures, thatthe product of the pressure by the volume was appioximatelya constant quantity. His conclusion may be stated in generalterms thus :— Let Vi, Vo, F3, etc., represent the volumes of the inclosed air, and Pj, P2, P3, etc., represent corresponding pressures; Then Fj P^ = V^ P^ = V^ P.^ = K, a constant quantity. That is, If the temperature is kept constant, the volume of a givenmass of air varies inversely as the pressure to which it issubjected. This relation is generally known as Boyles France it is c
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