Manometer - Mercury barometer calculations?

  • Thread starter Thread starter Rinehart
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Rinehart

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Ok, now i normally hate it when I see people who have obviously copied out a mathematics question that they have been given by school or college and posted it in yahoo answers.

But I am basically teaching myself manometers after my rubbish lecturer missed it out of the curriculum completely. This is the question I am stuck with, i don't know where to start!

If the mercury barometer reads 780mm what will be the atmospheric pressure in:-

A) meters of water

B) meters of oil of a relative density 0.8

C) in KN/m2

Relative density of Mercury = 13.6
mass density of water = 100kg/m3

Ans: A)10.6m B)13.25m C) 104KN/m2

Please can someone give me some info on how to complete this question.
 
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