e P connects withthe air-pump. Why did notthe pressure of air in theballoon cause expansion be-fore exhaustion ? Admit airto the receiver, and explainthe action of the balloon. A piece of the inner tube of a bicycle tire may take the placeof the toy balloon and stand. The tube should be half… … Fig. 19. 32. Measurement of Air Pressure. — When a bottle full ofwater is inverted in a shallow dish of water, the air pressureon the surface of the water in the dish holds up the waterin the bottle. To measure this air pressure, we have only tofind out how high a column of water it will hold up.…
Physics
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