. The principles of physics. Fig. 144. Fig. 146. Atmospheric pressure closes the uppervalve C in the piston. When the piston ispressed down (Iig. 145), the lower valvecloses, the upper valve opens, and thewater between the bottom of the barreland the piston passes through the uppervalve above the piston. When the piston is raised again(Fig. 146), the water above the piston is raised and dischargedfrom the spout. The liquid is sometimes said to be raised in a lifting-pumpby the force of suction. Is there such a force? Calling the specific density of mercury and disregardingthe vapor pressu
. The principles of physics. Fig. 144. Fig. 146. Atmospheric pressure closes the uppervalve C in the piston. When the piston ispressed down (Iig. 145), the lower valvecloses, the upper valve opens, and thewater between the bottom of the barreland the piston passes through the uppervalve above the piston. When the piston is raised again(Fig. 146), the water above the piston is raised and dischargedfrom the spout. The liquid is sometimes said to be raised in a lifting-pumpby the force of suction. Is there such a force? Calling the specific density of mercury and disregardingthe vapor pressure of mercury (.02 mm at 20° C), a waterbarometer would be 76 X = cm high when themercury barometer stands at 76 cm, provided there were nopressure exerted by the vapor of water. But at 20° C. the 174 MOLAR DYNAMICS. pressure of water vapor is om of mercury = X (=: cm) centimeters of water. Therefore the hight of thewater barometer would be — = cm, and thisis the limit of
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1895
