Physics
Mercury is preferred as a barometric liquid because :
- its density is high
- its vapour pressure is negligible
- it neither wets nor sticks to the glass
- all of the above
Fluids Pressure
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Answer
all of the above
Reason — Uses of mercury as a barometric liquid are —
- The density of mercury is greater than that of any liquid, so only 0.76 m of height of mercury is needed to balance the normal atmospheric pressure. Use of other liquids will require a much longer tube.
- The vapour pressure of mercury is negligible, so the vapours in the torricellian vacuum does not affect the barometric height.
- Mercury neither wets nor sticks to the glass tube, therefore it gives accurate reading.
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