Barg pressure is the pressure, in units of bars, above or below atmospheric pressure. The "g" at the end of the word indicates that the measurement is not absolute pressure, sometimes indicated by bara. According to The Engineering ToolBox, standard atmospheric pressure is, by definition, 1.01325 at sea-level and 0 degrees Celsius.Know More
Physics defines pressure as force per unit area. Atmospheric pressure is due to gravity acting on the air that surrounds the Earth. This is the reason standard atmospheric pressure is defined at sea level. As elevation increases, there is less pressure due to the decrease in the weight of air.
According to HowStuffWorks, "Humans cannot live unprotected at pressures greatly above or below atmospheric pressure." Pressure also affects the boiling point of water, so recipes require adjustments for high altitudes. Underwater, the weight of water acts on a body to increase pressure, so it rapidly increases. Pressure acting on materials deep within the Earth helps to form metamorphic rocks.
Hydromechanics, the study of the effects of force on fluids, involves the study of pressure. According to Bernoulli's Principle, streams of both liquids and gases reduce pressure. According to Pascal's Law, changes in pressures transmit to all parts of a confined fluid while holding a constant temperature.Learn more about Measurements
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 >
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 >
A Bourdon pressure gauge works by measuring the amount of change in a coiled or semicircular metal tube by a pressurized fluid inside. This is due to the principle that a flattened tube tends to regain its circular form when pressurized.Full Answer >
Found mainly in industrial process systems, differential pressure gauges are designed to measure pressure difference between two pressure points. According to WIKA Worldwide, a differential pressure gauge has two inlets connected to the points being monitored. In effect, it performs the mathematical operation of subtraction through mechanical means. As such, it eliminates the need for a control system or an operator to determine the reading differences.Full Answer >