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On the other hand, inquisitive person who is seeking to understandwhat is the suction, can obtain from the physics explanation, which gives him quiteclear idea not only about this but about many other things. Itknow that we and all objects around us are underatmospheric pressure, amounting to 15 pounds per square inch, i.e. 15pounds was the average weight of the air column with a basesquare inch and extending in height from sea level to the limits of the earthday. He learns that when he puts one end of the tube into the water, andthe other takes in the mouth and then pulls back her tongue, so formingway space, then there are two phenomena: one isthat the pressure of air trapped on the outside of the cheeks, notmore than balanced by the same air pressure inside of the cheeks, pressestheir inside; and another is that the air pressure on the surfacewater, not balanced over the same pressure inside the tube and mouth (which included part of the air from the tube), pushes the water inside the tubedue to inequality of pressure. Once having comprehended the essence of the so-calledsuction, he begins to understand what happens when, due toraising the piston in the pump and release of the water from atmosphericpressure, the pressure of the atmosphere on the water around the tube of the pump, not being alreadybalanced by a corresponding pressure in the pipe, causes water toclimb the pipe and follow the piston. Only now it's startingto understand why water cannot be raised higher than the theoretical limitequal to 32 pounds. This limit is much lower in practice due toimperfections of the devices. For if, simplifying thought, to assume thatpump tube has a cross-section of a square inch, the atmosphericthe pressure on the water in the well, equal to 15 pounds per square inch, maylift in the tube the water only to such a height that the entire water column will beweighing 15 pounds. Once installed, this view of the action of the pump,it becomes clear, and the action of the barometer.
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