What are the difficulties arising from using water in a barometer instead of mercury?
(N/A) The density of water is much lower than that of mercury. Since the atmospheric pressure $P = h \rho g$,the height $h$ of the liquid column required to balance atmospheric pressure is inversely proportional to its density $\rho$. For water,the required height would be approximately $10.3 \ m$ to $11 \ m$. $A$ barometer of this length is impractical to construct,handle,and transport,making mercury a more convenient choice.
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