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5. answer = Gradual fall in Mercury level: It signifies that the atmospheric pressure at the region has become low. If the relative humidity in the atmosphere is high, there there is a possibility of rain in that area.

6. answer =Reason for the leakage of ink at high altitude: As explained above, the pressure of the ink inside the tube of a fountain pen is atmospheric pressure which is high while the outside pressure is low. Due to pressure difference at high altitude, the air column exerts a pressure on the ink of the fountain pen.

7. answer = It is due to the great pressure exerted on the diver's body at the depth of the sea. The total pressure exerted is much more than his blood pressure. Consequently, to withstand that sea divers require special protective suit.