How high can a column of water be pushed up in a vacuum tube by the atmosphere?
Mercury has a density of 13.6 gram per cubic centimeter, whereas the density of water is 1 gram per cubic centimeter. The pressure of the atmosphere is high enough to push mercury 76 cm up through a vacuum tube. How high can a column of water be pushed up in a vacuum tube by the atmosphere? If a farm-type old fashioned vacuum pump were used to draw from a well, what would be the maximum depth of the well?
Atmospheric pressure is what presses the liquid column up. Since water weighs 13.6 times less per unit volume than mercury, there has to be 13.6 times more of it to weigh the same, and thus balance the atmospheric pressure.
Thus the answer is 0.76m * 13.6/1. A tad over 10m.
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