Manometer

[yellowjellybean]

I was doing some manometer questions and started to become confused. Take a manometer with one side open to the atmosphere and the other side connected to a reaction system. From what I think I understand from this TBR question if you want to detect small changes in volume caused by the reaction you would want a small bore radius on the atmospheric side keeping the bore radius on the other side the same. My confusion is if you have a different change in height wouldn't you have a different change in pressure? I thought the difference in pressures is constant.

Sorry I keep editing. I'm trying to narrow down my question.

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[yellowjellybean]

Grrr some threads say no matter what the diameter of the tube is, even if it is different on each side, the height difference will be the same. This seems to be different from what TBR is saying.