Question

A column of mercury in a barometer is 767.3 mm Hg high. Note, that in order for the pressures to be equal, density and height of a column are inversely proportional, therefore, (den1)(h1)=(den2)(h2). The density of mercury is 13.6 g/mL and the density of water is 1.00g/mL.
a) How high would that column be if it were water instead of mercury?
Why can't you simply substitute into the formula given in the problem?

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