A manometer measures the difference between two different points of pressure. A manometer works by balancing the weight of a column of fluid between the two points of interest.Know More
Different fluids are used in the fluid column depending on the nature of the pressure difference. If the different is large, then a heavy fluid, such as mercury may be used. If the difference is relatively small, such as that measured in a wind tunnel, then a lighter fluid, such as water is used.
There are many different designs of manometers, including digital models. The simplest design uses a sealed length of glass tubing bent into a U-shape. The tube is then filled with the liquid to the sealed end so that no air remains trapped in it. The open end of the tube is then attached to the system whose pressure is to be measured. Gas will exert pressure on the open end with the result that the liquid will be at a higher level in the sealed end than in the open end. The difference between the two levels is an indication of the pressure of the gas in the system.
Manometers are used in a variety of laboratory applications to measure the pressure of gases and liquids and also in the field of medicine.Learn more about Measurements
According to Reference.com, "fluid pressure" is defined as the pressure exerted by a fluid at a given depth. The weight of the liquid acting on a unit area combined with pressure acting on the surface of the liquid determines the amount of liquid pressure.Full Answer >
The primary difference between the centigrade, or Celsius, scale and the absolute, or Kelvin, scale is in their respective starting points. The Celsius scale sets the freezing point of pure water at sea level as 0, while 0 degrees Kelvin is absolute zero, the coldest temperature theoretically possible.Full Answer >
Linear feet is calculated by adding the lengths of points connected by straight lines. For example, the perimeter around a house can be measured in linear feet. Square feet measures area, and linear feet measures length.Full Answer >
Air pressure is measured by using a barometer, the value of which is given in varying units, including inches of mercury (in Hg) or millimeters of mercury (mm Hg), torr (Tor), bar or millibars (mb), pounds per square inch (psi) and pascal (Pa). Standard atmosphere, which refers to the sea-level atmospheric pressure at 0 degree Celsius, is expressed in atmospheres, commonly abbreviated to atm. One atm is equal to 29.92 in Hg, 760 mm Hg, 760 Tor, 1.013 bar, 1,013.25 mb, 14.7 psi and 101,325 Pa.Full Answer >