A mercury barometer reads 700.0 mm on the roof of a building and 715 mm on the ground. Assuming a constant value of 1.29 kg/m3 for the density of air, determine the height of the building.(adsbygoogle = window.adsbygoogle || []).push({});

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My setup was finding the difference in the pressures for mercury and get 15 mm Hg

Then use Hg density = 136000 to get a pressure using P=pgh

So P will equal 1999200

then subtract atmosphere pressure and divide the result by 12.642 (pg)

But the answer is wrong... Where did I go astray?

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# Homework Help: Use mercury barometer to fing height of building

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