A Manometer also referred to as pressure gaugemeasures the difference in air or liquid pressure by comparison it to an outside source, typically a sample of Earth’s atmosphere


How do Manometers or pressure gauges’ work? The World Times
A Manometer also referred to as pressure gauge measures the difference in air...

Manometer Definition

A Manometeralso referred to as pressure gaugemeasures the difference in air or liquid pressure by comparison it to an outside source, typically a sample of Earth’s atmosphere. There are many kinds of manometers, the only being a piezometer tube, that may be a single tube and a base that holds the liquid. Manometers are used in atmospherical surveys, weather studies, gas analyses and analysis of the atmospheres of different planets. They’re typically product of glass or plastic, and whereas most are scored for measurement, some will live changes digitally. The single-tube pressure gauge measures only the pressure of a liquid, since there’s no alternate place to check gases. A U-shaped pressure gauge primarily pits 2 totally different gas pressures against each other, and measures the strength of the captured gas. The free-flowing gas is usually air at the present atmospheric level.


The various types of pressure gaugeshave a lot of in common with the U-tube manometer that consists of a hollow tube, usually glass, a liquid part filling the tube, and a scale to measure the height of 1 liquid surface with respect to the other. If the legs of this pressure gauge are connected to separate sources of pressure, the liquid can rise in the leg with the lower pressure and drop in the other leg. The difference between the levels is a function of the applied pressure and the specific gravity of the pressurizing and fill fluids.

Using manometers for measuring pressure

A U-tube pressure gauge is that the simplest of the pressure measurement devices. Its name comes from the U-shape formed once the 2 ends of a flexible tube filled with liquid are raised to keep the liquid from coming out the ends. A U-tube pressure gauge may be a ‘liquid’ balance.

Mechanics of Manometers

A liquid is placed in the tube, usually a responsive liquid like mercury that’s stable under pressure. One end of the U-tube is then full of the gas to be measured, usually pumped in so the tube is often sealed behind it

The liquid is then balanced in the lower section of the U, depending on the strength of the gas. The air pressure pushes down on the liquid, forcing it down and into the closed end of the tube. The gas trapped in the sealed end also pushes down, forcing the liquid back to the other side.

Then a measurement is taken to check how way the liquid in the sealed end has been pushed either below the point of the liquid in the open end or on top of it. If the liquid is level, straight across in both tubes, then the gas is equal to outside gas pressure. If the liquid rises on top of this level in the sealed end, then the air’s pressure is heavier than the gas. If the gas is heavier than the air, it’ll push the liquid in the sealed end below the equal point.

Manometer Qualifications

Since Earth’s atmosphere will change supported elevation and temperature, the difference should be computed to achieve an average air pressure. Otherwise, the Pressure gaugecan show slightly different results at different elevations, creating precise studies not possible.