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Give reasons for the following cases.1. It is easier to swim in sea water than in river walls.2. The passangers are advised to remove ink from pen while going up in an aeroplane. |
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Answer» 1. The density of sea water is more than that of river water due to the presence of salt. Hence sea water offers more up thrust and only a very small portion of human body will be in sea water compared to river water. 2. In ink pen, ink is filled in atmospheric pressure. As we go higher pressure decreases and hence ink will have a tendancy to come out in order to equalise the pressure. |
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