. The Ontario high school physics. poured into a U-tubeclosed at one end (Fig. 138) it will be found —that the higher the column of the mercury inthe open branch, that is, the greater thepressure due to the weight of the mercury, FiQ 137 Aircom- the Icss the volume of the air shut up in pressed within a the closcd branch becomes. closed pessu^re ^^^ ^^^^ othcr hand gases manifest, under allto^pTs- conditions, a tendency to expand,ton- Whenever the pressure to which agiven mass of air is subjected is lessened, itsvolume increases. The com-pressed rubber ball takesits original volume and

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. The Ontario high school physics. poured into a U-tubeclosed at one end (Fig. 138) it will be found —that the higher the column of the mercury inthe open branch, that is, the greater thepressure due to the weight of the mercury, FiQ 137 Aircom- the Icss the volume of the air shut up in pressed within a the closcd branch becomes. closed pessu^re ^^^ ^^^^ othcr hand gases manifest, under allto^pTs- conditions, a tendency to expand,ton- Whenever the pressure to which agiven mass of air is subjected is lessened, itsvolume increases. The com-pressed rubber ball takesits original volume andshape when the hand iswithdrawn, and when theapplied force is removed figthe piston shoots a toy balloon, partiallyFio. 139.—Expansion of filled with air, is placed under the receiver air when pressure is „ . -, ^^rw i i • • removed. ot an air-jDump (r ig 139) and the air is ex- hausted from the receiver, the balloon swells out and if its pressedwithin aclosedtube byw e i g h tof mer-cury intlie

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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics