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www.reference.com/science/open-tube-manometer-e3d3e441f858396e

An open-tube manometer is a device used to measure pressures slightly below or above atmospheric pressure. The pressure of a substance, such as a gas, is given by the difference in levels of the manometric fluid.

www.sensorsmag.com/components/manometer-basics

For raised-well manometers, the well connection can be used for gauge and vacuum measurements. A variation of the well-type manometer is the inclined-tube (or draft gauge) manometer in Figure 8. With an inclined indicating tube, 1 in. of a vertical rise is stretched over several inches of scale length.

en.wikipedia.org/wiki/Manometer

Pressure measurement is the analysis of an applied force by a fluid (liquid or gas) on a surface. Pressure is typically measured in units of force per unit of surface area. Many techniques have been developed for the measurement of pressure and vacuum.Instruments used to measure and display pressure in an integral unit are called pressure meters or pressure gauges or vacuum gauges.

The open-tube manometer is another device that can be used to measure pressure. The open-tube manometer is used to measure the pressure of a gas in a container. The pressure of the gas is given by h (the difference in mercury levels) in units of torr or mmHg. Atmospheric pressure pushes on the mercury from one direction, and the gas in the ...

In this video we give the calculations of head of mercury, and also calculate the head of water used behalf of mercury. with the help of U shaped glass tube.

sciencing.com/differential-manometer-5964765.html

A differential manometer is a device that measures the difference in pressure between two places. Differential manometers can range from devices simple enough to be built at home to complex digital equipment.

MANOMETER QUESTION: What is the pressure of the sample of gas trapped in the open-tube mercury manometer SHOWN? What is the pressure of the sample of gas trapped in the open-tube mercury manometer shown to the right if atmospheric pressure is 736 mmHg and h = 9.2 cm? a. 92 mmHg b. 644 mmHg c. 736 mmHg d. 828 mmHg The image is below.