A manometer is a device that measures pressure with a column of liquid. A simple manometer consists of a U-shaped tube that contains a liquid. If the pressure is different between the two ends of the tube, the liquid will move away from the source of greater pressure.
An aneroid manometer is a device used by medical professionals to measure blood pressure, which is the force exerted on the walls of the arteries as the heart pumps blood around the body. The aneroid manometer is one of three main types of sphygmomanometer; both aneroid manometers and mercury manometers must be read manually and are used pretty much the same way, while the third, a digital ...
Figure 6. The pressure reading is always the difference between fluid heights, regardless of the tube sizes. With both manometer legs open to the atmosphere, the fluid levels are the same (A). With an equal positive pressure applied to one leg of each manometer, the fluid levels differ, but the distance between the fluid heights is the same.
Reading a Barometer and Manometer. How to Read a Barometer. The barometer was developed by Evangelista Torricelli in 1643. It measures atmospheric pressure. Atmospheric pressure pushes down on the mercury in the basin, causing the column to rise. The height of the column is equal to the Atmospheric Pressure.
A manometer is used for measuring differential pressure. It's just a scale. To interpret a manometer's readings, you multiply the reading obtained on the scale by the calibration factor. This ScienceStruck post explains how to read a manometer along with some examples.
A manometer (not to be confused with nanometer) is a good example, as it uses a column of liquid to both measure and indicate pressure. Likewise the widely used Bourdon gauge is a mechanical device, which both measures and indicates and is probably the best known type of gauge. ... Unlike other manometer gauges, the McLeod gauge reading is ...
Inclining the indicating tube has opened up the scale to permit more precise reading of the pressure. To improve and expand readability, certain Dwyer U-type and well-type manometers are available with a .826 sp. gr. red oil indicating fluid, and scales compensated to read pressure directly in inches of water.
Pressure is defined as a force per unit area - and the most accurate way to measure low air pressure is to balance a column of liquid of known weight against it and measure the height of the liquid column so balanced. The units of measure commonly...