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Figure 3 shows the levels of two liquids A and B after some air has been sucked out of the tubes through the tap. Use this information and the figure to answer questions 16 and 17.
![figpressure18520201204.JPG](/courses/uploads/figpressure18520201204.JPG)
State the reason for the rise in the levels of the liquids when air is sucked from the tube.