Functions of mercury barometer in points
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1. The density of mercury (=13.6×10 to power 3 kg /m) is greater than that of any other liquid so only 0.76m height of mercury column is needed to balance the normal atmospheric pressure. Use of other liquids require much longer tube .
2.The vapour pressure of mercury is negligible, and so the vacuum does not affect the barometric height.
3.The mercury neither wets nor sticks to the glass tube therefore gives accurate reading.
4.It can easily be obtained in a pure taste .
5. Mercury has a opaque and shinning surface therefore can me easily seen while taking the reading.
2.The vapour pressure of mercury is negligible, and so the vacuum does not affect the barometric height.
3.The mercury neither wets nor sticks to the glass tube therefore gives accurate reading.
4.It can easily be obtained in a pure taste .
5. Mercury has a opaque and shinning surface therefore can me easily seen while taking the reading.
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