Question

Give two reasons for the use of mercury as a barometric liquid ​

Answer 1

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Explanation:

Mercury is commonly used in barometers because its high density means the height of the column can be a reasonable size to measure atmospheric pressure. A barometer using water, for instance, would need to be 13.6 times taller than a mercury barometer to obtain the same pressure difference

Answer 2

Advantages of using Mercury as a barometric liquid are:-

1. The density of Mercury (=13.6 × 10³ kg/m³) is greater than that of any other liquid, so only 0.76 m 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 so the vapours in the torricellian vacuum does not affect the barometric height.

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