A Simple Micromanometer
Micromanometer consisting of a gas bubble trapped in a clear horizontal tube between two large vertical manometer chambers. If even more sensitivity is desired.
Pressure applied to the top of either vertical chamber will cause the vertical liquid columns to shift just the same as any U-tube manometer. However, the bubble trapped in the clear horizontal tube will move much further than the vertical displacement of either liquid column, owing to the huge difference in cross-sectional area between the vertical chambers and the horizontal tube. This amplification of motion makes the micromanometer exceptionally sensitive to small pressures.
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