Question

give two reasons for the use of mercury as a barometric liquid

Answer 1

1. Mercury does not stick to glass, and hence there's very little chance of a stray drop or two of mercury obscuring your reading.


2. Mercury remains in liquid state over a very wide range of temperature, and so it doesn't matter whether your barometer is being used at the Vostok Base in Antarctica or at the Death Valley in California, it's still gonna remain a liquid!