A mercury barometer reads 75 cm. Now 3 cm³ of atmospheric air is introduced into the tube. The mercury falls to a height of 65 cm and the length of air column above the mercury is found to be 15 cm. Calculate the cross-sectional area of the barometer tube.
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We see that when 3cm3 of air is allowed inside the barometer, the mercury column falls to length of 65cm and 15cm is length of air column above the mercury column. Now in the next case, Height of air column above mercury when the height of mercury reduces to 65cm is, 15cm as given.
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