Does the Diameter of a Manometer Matter?

Manometer height difference does not depend on tube diameter (except, of course, if the diameter is very small, and surface tension effects are significant). ... Manometer height difference does not depend on tube shape (except, of course, if the tube is of very small diameter, and surface tension effects are significant).

What does the manometer gauge measure?

A manometer can be designed to directly measure absolute pressure. The manometer in Figure 5 measures the pressure compared to zero absolute pressure in a sealed leg above a mercury column. The most common form of this manometer is the conventional mercury barometer used to measure atmospheric pressure.

Which is the most accurate manometer?