While mercury is the most common liquid used in a barometer, it is possible to use other liquids, such as water. To see why water barometers are inconvenient, calculate the length of the water column in a water barometer at atmospheric pressure. (with diagram) :confused:

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Well, use the formula for the pressure in a liquid.

The pressure at the same depth are equal.

At the surface of the mercury in the 'dish', the pressure is 1 atm.

Just below the mercury column, at the same level as the outside surface, you'll therefore have 1 atm, or 101 300 Pa (approx.)

Use the formula P = h\rho g, you get:

101,300 = h(13534)(9.81)

h = 0.763 m

That is the height of mercury for one atmosphere, with the density of mercury being 13534 kg/m^3.

Now, take water, with density 1000 kg/m^3. I'm sure you can find the height of water required :)