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Converting mmHg to mmH20

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    How would i go about doing this? I think its based on the density of water and mercury, but im still not sure how to do it.
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    the pressure due to a column of liquid of height h = p = \rho g h

    it follows then that the ratio of the heights of a water column and a mercury column which exerted the same pressure would be equal to the ratio of their densities, i.e. about 13.6 : 1

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