The “U”-Tube Manometer
Using a “U”-Tube enables the pressure of both liquids and gases to be measured with the same
instrument. The “U” is connected as in the figure below and filled with a fluid called the manometric
fluid. The fluid whose pressure is being measured should have a mass density less than that of the
manometric fluid and the two fluids should not be able to mix readily - that is, they must be immiscible.
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