Physics, fluids, mercury vs water?

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Jaded

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Mercury has a density of 13.6 g/cm3. A glass bulb filled with gas is connected to a manometer and mercury column in the side of the manometer open to the atmosphere is 0.50 cm higher than the side connected to the bulb.

picture of glass bulb
http://www.flickr.com/photos/33031842@N06/3177776884/

If water were used instead of mercury, what would the difference in the height of water in the two sides of the manometer be?
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Thanks for the help
 
0.50cm x 13.6 = 6.8cm H2O difference in height.
(= 1.2kPa pressure in the bulb. = 0.7kPa above atmospheric pressure).
 
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