How is height of a liquid column affected by atmospheric pressue? Explain with the help of an activity.
Answers
hey mate...
here is your answer...
1. A better solution is to take a tube filled with say, water. Close the tube at one end and open at the other. When vacuum forms at the closed end, the pressure of the column of water equals that of the air. The problem is, to do that you will need a tube ten meters high! (and that is why a suction pump can’t lift water over ten meters)
We then use the heaviest fluid we know of, mercury. The column can then be reduced to 760 mm (29.9 inches). In Europe, today, we measure the pressure in hecto-Pascal (hPa) and the average pressure at sea level is then 1013.25 hPa. But in the USA, it is still measured as inches of mercury (InHg).
2. Consider this point A, just at the surface of any liquid exposed to atmosphere. The hydrostatic pressure exerted by this liquid of height h is hρg. My confusion is tha that this pressure should be transmitted in all directions, so shouldn't Point A experience this pressure as well?
The net pressure at A should be : "hρg − Pa". But, this obviously sounds absurd, the pressure at A is considered to be just atmospheric pressure.
>>Refer to the image...
hope it helps...
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Explanation:
1. A better solution is to take a tube filled with say, water. Close the tube at one end and open at the other. When vacuum forms at the closed end, the pressure of the column of water equals that of the air. The problem is, to do that you will need a tube ten meters high! (and that is why a suction pump can’t lift water over ten meters)
We then use the heaviest fluid we know of, mercury. The column can then be reduced to 760 mm (29.9 inches). In Europe, today, we measure the pressure in hecto-Pascal (hPa) and the average pressure at sea level is then 1013.25 hPa. But in the USA, it is still measured as inches of mercury (InHg)..